Seasonal Planting
Know exactly what to plant and when for year-round garden success.
Seasonal Planting guides
Starting Seeds Indoors: Schedule and Setup
A week-by-week start schedule, the right mix and light, damping-off prevention, and a two-week hardening-off plan for sturdy seedlings.
SeasonalWhen Should You Plant Amaryllis Bulbs for Christmas Blooms?
Amaryllis needs 6 to 8 weeks from planting to bloom and — unlike tulips — no chilling period at all. Plant a large, firm bulb this week with the top third exposed, and you'll have Christmas flowers.
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SeasonalHow to Stop Squirrels From Digging Up Tulip Bulbs
Squirrels raid freshly planted tulip bulbs within days. Iowa State Extension's top defense: lay chicken wire over the bed and plant 6–8 inches deep.
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SeasonalCan You Grow Saffron at Home?
Yes — saffron (Crocus sativus) grows in home gardens down to USDA zone 4. Plant corms in late summer; harvest three crimson stigmas per fall flower.
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SeasonalWill Halloween Inflatables Kill Your Grass?
Yes — leave a Halloween inflatable parked on one spot of lawn for a couple of weeks and the grass underneath can die. University extension research explains why smothered turf turns into a dead yellow patch, plus the simple fix and how to repair damage before the fall seeding window closes.
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SeasonalShould You Buy Mums in Full Bloom or Covered in Buds?
The fullest-bloom mum at the garden center is already past its peak. Pick the bud-covered pot instead and get weeks more fall color for the same money.
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SeasonalWhy Planting Grocery Store Garlic Gives You a Terrible Harvest
Grocery-store garlic is fine for cooking — but it's often treated to stop sprouting and may carry plant diseases. Here's what to plant instead, and the 3 mistakes to avoid this October.
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SeasonalWhy October Is Your Last Real Chance to Overseed a Patchy Lawn
Those bare patches won't fix themselves — and spring seed loses to weeds and summer heat. Fall is when cool-season grass seed actually wins, but the window is closing now.
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SeasonalFind Your Frost Dates by ZIP Code: A Planting Guide
Look up historical frost windows by ZIP code, understand the risk behind each date, and use heat patterns to plan sowing and transplanting.
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SeasonalPlanting a Nursery Citrus in September? Why Winter Frost Still Kills Unprotected Trees
Scored a lush container lemon, lime, or orange tree at the garden center this September? Before you start digging that planting hole, hold your shovel. While deciduous apples and shade trees thrive with autumn planting, tender subtropical evergreen citrus plays by a high-stakes set of winter rules. Young nursery citrus saplings possess succulent unlignified shoots, paper-thin bark, and delicate root systems that freeze and die when winter temperatures drop into the upper 20s. Putting a potted citrus into the ground in September leaves it exposed to lethal winter frosts before its roots can knit into native soil. Here is the verified horticultural science behind citrus cold hardiness, why Sprouty stopped Sophie mid-plant, and how to safely stage your potted tree until spring—or protect it hard all winter long.
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SeasonalSow Spinach Before Late September and You Miss Yolo’s Cool Seed Window (Why Soil Temperature Dictates Direct Seeding)
Eager to kick off your fall vegetable garden the moment September arrives? Hold onto that seed packet. In Yolo County and across the inland Sacramento Valley, direct-sowing spinach seeds in early September is one of the quickest ways to guarantee germination failure. When afternoon sun bakes garden beds above 75°F–80°F, spinach seeds enter thermal dormancy (thermodormancy) or rot from damping-off pathogens before sprouting. Sowing spinach successfully demands waiting for the critical late-September cool seed window—specifically the last two weeks of the month—when soil temperatures reliably drop into the 50°F–68°F sweet spot. Here is the plant biology, the official UC Master Gardener guidelines, and how Sprouty stopped Sophie from wasting her spinach seeds.
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SeasonalPlanting a Nursery Avocado in September? Why Winter Frost Still Kills Unprotected Trees
Found a lush potted avocado tree at the garden center this September? Hold your shovel before digging that hole. While deciduous apples and shade trees love autumn planting, tender subtropical evergreen trees play by lethal winter rules. Young nursery avocados have tender green stems and shallow root systems that cannot survive winter freezing temperatures without serious protection. Putting an avocado in the ground in September leaves it exposed to killing frosts (often 28–30°F) before roots can establish. Here is the horticultural science behind avocado cold hardiness, why Sprouty stopped Sophie mid-plant, and how to safely protect or stage your tree.
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SeasonalTropical Milkweed and Monarchs: OE Risk and Native Alternatives
Learn how year-round tropical milkweed can raise monarch OE risk, why timing varies by region, and how to choose appropriate native alternatives.
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SeasonalBuy California Natives in September, But Don't Plant in Summer Heat: Why New Roots Stall (And When to Put Them in the Ground)
September nursery tables are packed with lush California native shrubs and perennials. The secret? Absolutely buy them now before prime stock sells out, but do not drop them into baking late-summer soil. Planting into lingering heatwaves stalls delicate roots and invites deadly root rot. Here is the botany behind summer dormancy, the staging trick, and when to plant for zero transplant shock.
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SeasonalTop 5 Flowering Plants to Plant in September
Think spring is the only time to plant flowers? September is the horticulturist's secret weapon. Warm soil, cooling nights, and autumn rains create ideal conditions for root establishment. From instant pollinator magnet asters and cold-hardy violas to century-living peonies, here are the top 5 flowering plants to plant in September, complete with USDA zone notes, timing windows, and the #1 mistake to avoid for each.
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SeasonalWhy Planting California Native Bulbs Before the First Rains Will Rot Them (And When to Plant)
Spotted California native bulb corms in nursery bins this September and ready to plant them immediately? Hold your trowel. Burying native geophytes like Brodiaea and Ithuriel's spear in warm, irrigated late-summer soil breaks their evolutionary dormancy and causes rapid fungal rot. Here is the botany behind summer dormancy, why you must wait for the first autumn rains, and how to store them cool and dry right now.
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SeasonalWhy Waiting Past Mid-September to Plant Inland Fall Potatoes Will Delete Your Harvest (The Yolo Window)
Thinking about waiting until late autumn to bury your seed potatoes? If you garden inland near Davis, Sacramento, or the interior San Joaquin Valley, hesitate past mid-September and your fall potato crop is effectively canceled. Here is why the narrow Yolo planting window demands seed in the ground during the first two weeks of September, and the soil temperature science behind it.
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SeasonalFrost Hit Your Sweet Potato Vines? Why You Must Dig the Same Day (Emergency Harvest Guide)
Woke up to blackened, wilted sweet potato vines after the first autumn freeze? Don't leave them in the soil until the weekend. Once frost kills the foliage, decay organisms can race down the vines into the tubers in hours. Here is why you need to dig today, how to harvest without skin damage, and the proper curing secrets that save your harvest.
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