The craft & science of growing
Learn to grow anything, anywhere.
Clear, science-backed guides for growers at every level — bedrooms, balconies, backyards.
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Latest · The Flower Library
Umbel: The Umbrella-Shaped Flower Cluster, and the Onion Family's Look-Alike
An umbel is a flower cluster whose stalks all spring from one point, like the ribs of an umbrella. Agapanthus is the classic garden example, and the family it belongs to builds the shape a different way.
Read this week's lead →New: tools for the bench
Tools you can use today.
Santa Clara County
The Planting Calendar
What to sow this week, and why that week.
Eighty-two crops, worked out from this county’s own climate record rather than a national chart.
Open the calendar →
Plant diagnosis
The Field Key
What’s wrong with my plant? Start here.
Answer what you can actually see and walk a botanist’s decision key to a sourced answer. No photo upload, no black box.
Open the Field Key →
Indoor light
The Grow-Light Calculator
How much light is your plant actually getting?
Turn a lamp’s intensity and hours into a daily total, or work backward from a plant’s target to the setting you need.
Open the calculator →
Trees
The Tree Key
What tree is that?
Look at a leaf and the bark, answer what you can see, and a picture key narrows it to a name, with a photo of every tree.
Open the Tree Key →
New here?
Start with these three.
1Rescue what's struggling
Diagnosis
Why Plants Struggle in Good Soil
Five checks, in the order worth making them, before you blame the pot: light, water, roots, pests, salts.
Run the five checks →
2Understand the plant
Apprenticeship
How a Plant Works
Module I of the Apprenticeship: ten short lessons on what a plant is doing with its roots, stems and leaves.
Begin Module I →
3Pick a first plant
Houseplants
Pothos, the Forgiving Starter
The best first plant you can own, plus the small handful of things that can still trip you up.
Meet the pothos →
Fresh from the bench
New in the Library
The Leaf Library
Reniform: The Kidney-Shaped Leaf, and the Wild Ginger the Floras Can't Agree On
The Substrate Library
Feeding on Distilled or RO Water: The Fertilizer Carries the Diet
The Plant Library
Chimeras, Sports and Lab-Grown Leaves: How Variegated Monstera Work
The Pollinator Library
The Honey Bee: A Newcomer With Pollen Baskets, and What It Means for the Bees That Were Here First
The Pollinator Library
The Hover Fly: A Small Striped Fly at the Flowers, With Larvae That Hunt Aphids
Myths Demystified
Do mycorrhizal products help your houseplants?
12 collections
Explore the Libraries
The Plant Library
One plant at a time, in depth: how it's built, where it comes from, what it needs.
9 profiles
Care Guides
Light, water and potting mix for each plant group, with a printable care sheet.
16 guides
The Substrate Library
Which potting mix or garden soil to use and why, including the recipes we use ourselves.
15 guides
The Leaf Library
Learn to read a leaf, one shape at a time.
Just started
The Flower Library
Learn to read a flower, one form at a time.
6 forms
The Pollinator Library
The Bay Area pollinators doing the work in your garden, and how to tell them apart.
Just started
California Natives
Plants native to the Bay Area, and how to grow them in a real yard.
15 plants
Myths Demystified
Common plant advice, checked against the evidence, one claim per entry.
8 verdicts
The Field Manual
Name the pest or problem on your plant, then deal with it.
6 entries
The Propagation Lab
Cuttings, division, seed and tissue culture, step by step.
Just started
The Workshop
Tools, tested the way we'd test a recipe.
Just started
The Window Box
Growing on a sill, a balcony or a fire escape.
Just started
The Guild Letter
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In the latest issue · Issue 04 · October 2026- Choose your natives now, and plant them with the rain
- Skip the fridge: here, the ground supplies garlic's cold
- The Apprenticeship opens with four free modules
The Planters' Guild
A guild for the people who grow.
Everything here is free to read. The Guild is a craft community — a free apprenticeship, a growing library, and a place to belong among other growers. Learn the craft, and support the work when it feels right.