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by Farmer Fred
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Garden book author and citrus expert Lance Walheim, is a big proponent of growing citrus trees in containers. We discuss his techniques in today’s podcast, along with shameless plugs for his new book, “Citrus: A Gardeners’ & Fruit Lovers’ Guide.”For those of you in a hurry, here are some of the important points we touch on in the podcast:Choose compact citrus varieties for containers — Meyer lemon, kumquat, calamondin, and Bearss limes are ideal; avoid vigorous types like Lisbon lemon or grapefruit, which will quickly outgrow most pots.Upgrade container size gradually When repotting, go up only one size at a time (e.g., sleeve → 10-gallon → 15-gallon → half barrel). Transplanting immediately from the nursery pot to an oversized container can hold excess moisture around the roots and can cause rot.Prioritize drainage above everything else Check that your container has multiple drain holes (at least 4–5 for a half barrel, ½-inch diameter or larger), and drill additional side holes if needed.Raise your container off the ground Set pots on bricks, boards, or a furniture dolly to keep drain holes clear, prevent roots escaping into the native soil, and allow the bottom of the pot to dry properly. If setting pots in catch dishes, don’t let them hold standing water.Use quality commercial potting mix, not backyard soil Garden soil may compact easily, drain poorly, and can introduce pathogens. Consider amending potting mix with perlite, builder’s sand, or pumice for improved aeration, keeping in mind this will cause it to dry out faster.Avoid dark-colored pots in hot climates Black plastic containers in full sun can heat soil to 120–130°F on warm days, killing roots. Use fabric pots, light-colored containers, or nest a dark pot inside a larger one filled with mulch for insulation. Surrounding the citrus pot with other pots can help keep the citrus roots cooler.Fertilize consistently and at a diluted strength Use a liquid or water-soluble citrus fertilizer every two to four weeks. Make sure it contains not just nitrogen but also phosphorus, potassium, and micronutrients like iron, zinc, and manganese.Leach the soil every one to two months Run water slowly through the entire pot multiple times to flush out salt buildup. A white mineral ring around the pot is a sign salts have accumulated.Use a moisture meter to check watering needs Finger-testing the surface is unreliable in root-bound pots; a moisture meter tells you conditions 12 inches down where it matters.Mulch the top of the container A thin layer of bark chips or compost slows moisture loss and protects surface roots. Keep mulch away from the trunk.Transition plants indoors and outdoors gradually Over one to two weeks, move the pot into progressively shadier spots before bringing it inside, and reverse the process in spring. Expect some leaf drop indoors; a bloom cycle usually follows.Treat for pests before moving indoors Apply Neem oil or Spinosad before bringing the tree inside to prevent scale or whiteflies from establishing. Avoid applying oil when temperatures are above 85–90°F.Prune to maintain size and airflow Keep the tree’s center open for air circulation, remove crossing branches, and cut back vigorous shoots. Do major work (including root pruning, if necessary) in winter, the least stressful time.Look for Flying Dragon rootstock if you want a true dwarf This trifoliate orange rootstock keeps trees to 5–6 feet and is well-suited to long-term container growing, though it can be hard to find.Buy
The Beyond the Garden Basics newsletter and podcast has been around awhile, with over 450 editions since August of 2022. That’s a lot of gardening info!Checking out nearly four years of newsletters and podcasts to learn more about gardening can be a daunting task. So, to help ease the process a bit, here are the seven most clicked-on (and time spent with) editions. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit gardenbasics.substack.com/subscribe
In case you need a refresher course, here are some points about the benefits of using compost in your garden, according to the UC Master Gardeners of Alameda County:• Improves Soil Structure (Tilth): Lightens heavy clay soils and adds structure to sandy soils.• Saves Water: Increases the water-holding capacity, reducing runoff and water usage.• Feeds Plants & Soil Life: Adds slow-release nutrients and boosts beneficial microorganisms and earthworms.• Balances pH: Helps to buffer and balance soil pH (acidity/alkalinity).• Reduces Needs: Lowers the need for commercial soil conditioners and chemical fertilizers.• Protects Plants: Encourages healthy root structure, helps control erosion, and acts as a mulch to reduce weeds and moderate soil temperature.How to Use Compost (UCANR Recommendations)• As a Soil Amendment: Mix 1–4 inches of compost into the top 6–10 inches of soil before planting.• For New Beds: Apply 3-4 inches of compost and turn into the soil.• As Top Dressing/Mulch: Apply 1-3 inches around established plants, trees, and shrubs (keeping it away from the stems).• For Lawns: Spread a 1/2 inch layer of compost over the lawn in the spring.• When to Apply: Fall is best for improving soil structure, but it can be applied in spring to prepare for planting.• Materials: Composting kitchen and yard waste helps prevent landfill waste and acts as a nutrient-rich fertilizer.For the Snarkies among you who answered, “And compost mulch provides a place for cats to poop.” Hey! Get your head out of the toilet. We covered how to thwart that in a previous newsletter.But if you think composting is a lot of work, what if I told you that you can make compost using just two ingredients, and you don’t have to turn the pile, ever!Now that I have your attention, here’s what Kellie Hallenbeck and Judy McClure had to say in a recent Sacramento County Master Gardener newsletter:“The average person in the U.S. consumes about three cups of coffee per day, with landfills receiving 75% of those spent coffee grounds. Deep in landfills, grounds are robbed of oxygen, so they cannot decompose aerobically like they do in a compost pile or worm bin. Instead, coffee grounds are subject to anaerobic decomposition that can produce large amounts of methane. Methane is a greenhouse gas contributing to global warming, 25 times more potent than carbon dioxide.Composting with coffee grounds is easy if you remember they are high in nitrogen and considered green for compost purposes. Just add a good supply of carbon-rich material, like dried leaves and shredded paper. Too much nitrogen can cause the release of ammonium gas and cause foul odors. At the same time, too little nitrogen will slow down the decomposition process. Follow your routine of food scraps and grass clippings by mixing 1 to 2 volumes of “browns” (dry, woody materials) to 1 volume of “greens” (moist, green materials, filters with grounds). Add water and turn the mixture to add air.” (Or, don’t turn. Read today’s podcast transcript interview further on in this newsletter (or listen to it, above) with Master Gardener and composting expert Susan Muckey to find out the why and how).“In 2022, the Compost team experimented using only coffee grounds as the “greens” and dried leaves as the “browns” to see how the final product compares with traditional methods. Too many coffee grounds were added, resulting in the pile being too wet. The Compost team is trying again with a bin made of a hog/chickenwire ring. The pile was demoed at the March 2026 Open Garden. During you next FOHC visit, stop by the Compost area to check on the process.How can you help to keep coffee grounds from entering the landfill? Take a bag (or 2 or 3) for your home garden during Open Garden Days.Small changes add up over time. Just think: by adding grounds to your compost, you will be reducing waste and protecting our environment, all the while having your coffee too.”A 4’×5’ sheet of 6-inch Concrete Reinforcement Wire (CRW) wrapped end-to-end forms a cylinder roughly 19 inches across and 4 feet tall — plenty of structure to hold a season’s worth of material while letting air reach the pile from every side. The wire ends along the seam can be secured with several zip ties through the opposing squares to lock it shut, so no special tools
Is there a better-looking, longer lasting, cut flower than the alstroemeria? Is there a more invasive, underground spreading plant than the alstroemeria?Sometimes, to get to heaven, you have to go through a little hell.Also known as the Peruvian Lily, Lily of the Incas, Parrot Lily, Princess Lily, and “How the Heck Did You Get Over to the Other Side of the Garden?”, alstroemerias can easily last two weeks as a cut flower. Longer, if you are conscientious about clean water and floral preservatives (more on that below). This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit gardenbasics.substack.com/subscribe
In this episode, we discuss the essentials of basil cultivation, highlighting the basil basics for home gardens. We cover basil soil preparation, planting, timing, and a few of the various flavorful basil varieties such as Sweet, Thai, and cinnamon basil. We include basil care tips such as watering, fertilization, and pest management.Special guest Rose Loveall-Sale from Morningsun Herb Farm shares her knowledge about basil’s cultural significance and culinary uses, as well as sharing her vast knowledge of even more basil varieties. Her audio was taken from her how-to basil video on YouTube , because this week she was busy getting ready for Morningsun Herb Farm’s annual open house day, on Saturday, May 2, an event that features speakers, vendors, crafts, demonstrations, and informational booths (including the Solano County Master Gardeners) at the nursery outside Vacaville, in the San Francisco Bay Area.More links and pictures about basil in today’s podcast transcript!ALL ABOUT BASIL - THE PODCAST TRANSCRIPTFarmer Fred:[0:00] If there’s one herb that practically begs to be grown at home, it has to be basil. The good news? It’s not fussy at all. It just wants what most of us really want. Warm weather, plenty of sunshine, and a good drink of water every now and then. Basil is happiest in fertile, well-drained soil that has lots of organic matter. Most garden soils, though, work just fine. But before you plant anything, it’s always worthwhile doing a quick soil test so you know exactly what you’re working with.Farmer Fred:[0:30] If the soil needs a nutrient boost, work your fertilizer into the top six inches. If you’re going the compost route, spread no more than one inch of well-composted material per 100 square feet. A little goes a long way here. The golden rule with basil is wait until after the last frost before planting. Cold soil is the enemy. If you’re starting from seed, basil germinates best when soil temps are between 75 and 85 degrees Fahrenheit, and you can expect the little sprouts to pop up in about 10 to 14 days. If you’re starting with transplants, we’ll give them about four to six weeks to size up and aim for a mid to late May planting. You want to sow seeds about one eighth of an inch deep. That’s barely covering the seed with perhaps some vermiculite. Cover it lightly and keep the soil consistently moist. Then, once your seedlings emerge, thin them to three to four inches apart. Then gradually work toward a final spacing of about 12 inches.Farmer Fred:[1:32] Hey, and don’t throw away what you thin out. Those little guys can be transplanted elsewhere or even tossed into your dinner salad. One tip worth remembering, basil grown in full sun develops more essential oils, and that means richer, more complex flavor. Shade-grown basil? It just isn’t the same, really. So the age-old question is, well, how much basil should I plant? Over a whole season, plan on 5 to 10 plants per person for fresh use, and maybe another 5 to 10 plants if you want to put some away for storage. That may seem like a lot, but believe me, you will go through it. The Master Gardeners of Sonoma County have suggestions for basil varieties worth trying.Farmer Fred:[2:15] Sweet basil is probably the most popular. It’s a large-leafed Mediterranean variety. It’s the primary culinary basil used in Italian cuisine, and it gets up to about two, two and a half feet tall. Purple or opal basil is similar to sweet basil, but it has dark bronze-purple leaves and pink flowers, and that’s a welcome color contrast in the garden and in dishes, although visually it’s really not very suitable for pesto. A somewhat more tender variety, purple basil grows to about the same height as sweet basil, about two and a half feet. Lemon or lime basil is a smaller plant, about 12 inches tall with white flowers, and a mild citrus aroma paired with many types of food. There’s also Greek or globe basil. That’s even smaller, about 6 to 12 inches tall, with tiny compact leaves, soft stems, and a very spicy character that’s useful in salads. Its compact size makes it a good container plant, too, and its hardiness allows it to thrive in poor conditions. Another one worth trying, <a target="_blank" href="https://plan
Sweet potatoes are one of the most under-appreciated crops you can grow. But it will reward those gardeners who give sweet potatoes what they really need: heat.As you will hear in the podcast with Master Gardener and vegetable expert Gail Pothour, sweet potatoes have some very particular needs. A San Joaquin County (CA) listener wrote in asking how to alleviate the frustration of trying to sprout sweet potato slips from organic potatoes in a cold house in January. That’s the core problem right there — sweet potatoes are tropical plants, closer kin to morning glory than to the white potato, and they simply won’t cooperate without warmth. They’ll sit, sulk, and rot before they ever sprout.The good news is that our region of California is genuinely excellent sweet potato territory. Twenty percent of all commercially grown sweet potatoes in the U.S. come out of Merced County here in California, so conditions here are about as favorable as it gets.Timing is everything. Don’t rush them into the ground — mid-May is about right, once the soil has had a chance to warm up. Plant slips, not seeds — always buy certified disease-free slips from a reputable nursery or mail-order source. More about creating sweet potato slips, from the Santa Clara Master Gardeners* To grow your own slips:* Start in February or March.* Fill a shallow container that has drainage holes with moist potting soil.* Nestle in the sweet potato so it is half covered in the soil. Place in a waterproof tray.* Cover to retain humidity and keep it warm.* Remove covering when sprouts appear in 2–4 weeks.* When sprouts are 6 inches long, clip off 1 inch from potato (to prevent possible disease propagation from the mother potato) and plant directly in pots (or root in water then transplant into pots).The Santa Clara Master Gardeners have a video, as well, about creating your own sweet potato slips.Grow in raised beds or ridged rows, about 12 inches apart with three feet between rows. They need room to sprawl. Soil prep matters too. Work in some compost and a light dose of nitrogen before planting, and aim for something loose and sandy — sweet potatoes hate compacted ground. Water consistently for the first few weeks while the vines establish, then ease off. Once they’re growing vigorously, they don’t need much babying. For fertilizer, lean toward something a bit higher in phosphorus and potassium than nitrogen — a 3-4-4 or a 2-2-2 would be ideal.Harvest runs anywhere from 90 to 140 days after transplanting. Watch for the vines to start yellowing — that’s your signal. Don’t wait too long, though. Cold is the enemy at this stage too: roots can suffer damage if temperatures dip below 50 degrees, even briefly. If frost is coming, get them out of the ground and into boxes in a warm, slightly humid spot right away for curing.More about Sweet Potato Curing and StorageFrom “Growing Sweet Potatoes in the Sacramento Region”:Newly harvested sweet potatoes are not very sweet. They require 1 to 2 months of curing and/or storage before they will develop the sweet, moist taste we expect (part of the starch content turns to sugar). Freshly harvested sweet potatoes can, however, be candied or made into pies. This is a good use for roots that may have been damaged during harvest. Sweet potatoes need to be cured if they are to be stored for long periods. The curing process allows any bruises or blemishes on the thin skin to dry so that rotting in storage is reduced. If the sweet potatoes are not intended for long-term storage, curing is not essential; however, storing freshly-harvested sweet potatoes for several weeks will improve the flavor.After the roots are harvested and thoroughly dry, put them in a warm, humid place (80° to 90°F at 85% relative humidity, if possible), or carefully lay the roots out in a warm, dry, and well-ventilated area for 1 to 2 weeks to cure and until all skin wounds have healed.Commercial sweet potato growers have curing rooms with heaters, humidifiers, and evaporative coolers to maintain proper temperatures and humidity. Providing such curing conditions can be rather daunting for home gardeners, so listed below are some suggestions for curing sweet potatoes at home. Several of these suggestions are courtesy of the Santa Clara County Master Gardeners who conducted a sweet potato trial in 2006. Sweet potatoes need to be handled gently, so be careful when placing the roots into containers (avoid throwing or dropping them) so that they will not become bruised, which will keep them from storing well and can trigger them to start decaying.<
Soil mycorrhizae. What is it? If you’ve seen any of the “Avatar” movies, you would know that James Cameron probably has a good grasp of the subject…and you would have a basic understanding of what we are going to talk about today. Without mycorrhizal activity, there would be very little gardening.To return to the “Avatar” comparison, you know how in those movies, if anyone fell ill or was near death or they needed to call in the National Guard, they could stick a tree root in their ear and they’d get healthy or victorious, and then the movie could have a happy ending? To quote the “Avatar” Wiki:In Avatar, tree roots are critical, bioluminescent conduits for Eywa, Pandora's neural network, allowing Na'vi to connect to their deity and ancestors. Key structures include the Tree of Souls and Tree of Voices, featuring complex, willow-like root systems that facilitate tsaheylu (the bond) for communication and data transfer.Can you see mycorrhizae activity? Yes! If you have a microscope: (p.s. “Arbuscular”: Arbuscular mycorrhizal fungi (AMF) are soil fungi (subphylum Glomeromycotina) that form symbiotic relationships with roughly 80% of terrestrial plant species. They colonize plant roots, forming tree-like structures called "arbuscules" inside root cells that act as exchange sites. AMF improve plant uptake of phosphorus, nitrogen, and water, in exchange for plant carbon, increasing plant biomass and stress tolerance.) Aren’t you glad you asked?What about if you turn over the mulch that’s beneath your persimmon tree. Is that white stuff on the bottom of the mulch that’s in contact with the soil…is that mycorrhizae?Short answer: No. Long answer: That white stuff on the bottom of mulch is a decomposing fungi, saprophytic fungi. Saprophytes act as decomposers breaking down dead organic matter, while mycorrhizal fungi form symbiotic partnerships with living plant roots.Falling asleep yet? Here’s Ben Faber, a soil, water, and subtropical crops advisor for the Ventura/Santa Barbara UC Cooperative Extension, with his more astute look at mycorrhizae. This is from his newsletter, “Topics in Subtropics”:Mycorrhizae means fungus (myco) root (rhizae). These root-associated fungi predate the evolution of terrestrial plants, and the partnership with mycorrhizal fungi facilitated the establishment of plants on earth. Mycorrhizae form symbiotic associations with more than 70% of land plants across a broad range of terrestrial ecosystems. Plants supplies mycorrhizae with photo-assimilated carbon in exchange for nutrients and water. This is the definition of a perfect relationship whereby the two sides support each other and have a personal interest at maintaining their counterpart well-being for survival. Once mycorrhizae colonize the host plant, its mycelium can grow over large distances to neighboring plants connecting them together by a common network. This extension of the root network allows plants to acquire water and nutrients (especially nitrogen and phosphorus) far beyond its root zone, rendering plants more resilient to drought and nutrient deficiency. The ability of mycorrhizae to form this underground web also enables the connected plant to communicate with each other through chemical signals and exchange water and nutrients. For example, in forest ecosystems, saplings rely on nutrients and carbon supply from older trees sent through the mycorrhizal network. This underground mycorrhizal web has also great physical properties because they improve the soil structure by forming stable soil aggregates thereby limiting erosion and leaching of nutrients.Today’s podcast features two interviews. The first is with Sacramento County Master Gardener Pat Rosales. We discuss the chances of you buying living mycorrhizae that might be an alleged part of that bag of potting soil you’re coveting. Or even more doubtful, an ingredient in the fertilizer you’re reaching for. Science says: doubtful. Science also says: “You’ve got to be kidding me!”We do discuss ways to create your own soil mycorrhizae, as well as how to keep what mycorrhizae you already have in top shape.The second part of today’s podcast features Alaskan garden writer Jeff Lowenfels, author of the “Teaming with…” series of books about what’s in the soil below your f
If we sound excited, we are! It’s getting close to tomato planting time! In this week’s podcast and newsletter, Don Shor of Redwood Barn Nursery in Davis, CA and I discuss this year’s unusual weather, emphasizing the importance of proper soil temperature and patience when planting. Don shares insights on different tomato varieties, explaining determinate, indeterminate, and heirloom types, alongside effective watering and mulching techniques for possible drought conditions. We offer tips for new gardeners, encouraging variety and restraint in their tomato-growing journey. This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit gardenbasics.substack.com/subscribe
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