Zone 9 · Leafy Greens Growing Guide
One of the fastest crops in the garden. Sow directly, harvest outer leaves as cut-and-come-again. Bolts in heat -- succession sow every 2 weeks through spring and again in fall.
In Zone 9, Lettuce (Leaf) can be planted outdoors from Oct 3 — the window closes around Feb 10.
Fall through spring crop only. Summer heat causes immediate bolting.
Zone 9 is split into two subzones. The a/b distinction affects your exact last frost date by 1–2 weeks -- meaningful for heat-sensitive crops and fruit tree hardiness.
| Subzone | Last frost | First fall | Season | Min temp |
|---|---|---|---|---|
| 9a | Jan 29 | Dec 22 | ~331 days | 20 to 25°F |
| 9b | Jan 22 | Jan 12 | ~361 days | 25 to 30°F |
plant detects your subzone from your location and adjusts planting windows accordingly.
Here is what to expect at each stage — and what to do when you get there.
Keep soil consistently moist but not waterlogged. Most leafy greens germinate best at 50-65°F -- they actually prefer co
Thin seedlings to the recommended spacing -- crowded leafy greens bolt faster and produce less. The thinnings are edible
Begin harvesting outer leaves now -- this encourages more growth from the centre. Do not wait for the plant to be 'finis
Harvest cut-and-come-again -- remove outer leaves and let the centre keep growing. For butterhead types, harvest the who
Once bolting starts the flavour changes -- harvest everything immediately. Bolted leaves are still edible but more bitte
At peak: A well-managed lettuce plant gives you a harvest every 1-2 weeks
Leaf lettuce is one of the easiest and fastest crops you can grow. You can be eating it within 30 days of sowing.
Leafy crops need consistent nitrogen. Liquid feed every 3 weeks. Hot conditions cause bolting regardless of feeding.
Sow every 2 weeks from your last frost date through early summer, then again from late summer through autumn. Pause in the heat of summer -- lettuce bolts above 75°F and turns bitter. A 2-week interval means you always have a row coming in as the previous one peaks. Sow just enough for 1-2 weeks of salads per batch rather than a full bed at once.
Some plants help Lettuce (Leaf) thrive. Others compete or cause problems.
Something went wrong? Here is what likely happened and what to do differently next time.
What happened: Most leafy greens actually handle light frost well once established -- it can even improve flavour. But young seedlings are more vulnerable. If the damage happened at the seedling stage, a late frost likely caught them.
Next season: Cover seedlings with fleece if frost threatens in the first few weeks. Established leafy greens generally recover from light frost on their own.
What happened: Slugs love leafy green seedlings, especially in wet conditions. Downy mildew affects plants in humid, overcrowded conditions. Flea beetles leave tiny holes in leaves -- especially on arugula and kale.
Next season: Thin seedlings properly to allow airflow. Protect from slugs in the first few weeks. Row cover helps with flea beetles on susceptible varieties.
What happened: Leafy greens in waterlogged soil develop root rot quickly. More commonly, warmth and long days trigger bolting -- the plant sends up a flower stalk and the leaves become bitter. This is the plant completing its lifecycle, not a failure of care.
Next season: Bolting is largely about timing. Sow earlier in spring or switch to a fall sowing -- cooling temperatures signal the plant to keep producing leaves rather than flowering.
What happened: Irregular watering is a major bolting trigger in lettuce and spinach. A dry spell followed by heat pushes them to flower and seed rapidly.
Next season: Keep moisture consistent -- mulching around leafy greens makes a real difference. Water in the morning so leaves dry during the day.
What happened: Heat and long days cause most leafy greens to bolt -- this is the most common reason they fail. The plant is not dying, it is doing what it is designed to do. Once bolted the leaves become bitter and inedible quickly.
Next season: The fall sowing is almost always more successful than spring for leafy greens. Cooling temperatures give you longer, slower-bolting plants. Shade cloth can also extend the spring crop by a couple of weeks.
Something didn't work out? Here is what likely happened and what to do differently next season.
What happened: Most leafy greens actually handle light frost well once established -- it can even improve flavour. But young seedlings are more vulnerable. If the damage happened at the seedling stage, a late frost likely caught them.
Next season: Cover seedlings with fleece if frost threatens in the first few weeks. Established leafy greens generally recover from light frost on their own.
What happened: Slugs love leafy green seedlings, especially in wet conditions. Downy mildew affects plants in humid, overcrowded conditions. Flea beetles leave tiny holes in leaves -- especially on arugula and kale.
Next season: Thin seedlings properly to allow airflow. Protect from slugs in the first few weeks. Row cover helps with flea beetles on susceptible varieties.
What happened: Leafy greens in waterlogged soil develop root rot quickly. More commonly, warmth and long days trigger bolting -- the plant sends up a flower stalk and the leaves become bitter. This is the plant completing its lifecycle, not a failure of care.
Next season: Bolting is largely about timing. Sow earlier in spring or switch to a fall sowing -- cooling temperatures signal the plant to keep producing leaves rather than flowering.
What happened: Irregular watering is a major bolting trigger in lettuce and spinach. A dry spell followed by heat pushes them to flower and seed rapidly.
Next season: Keep moisture consistent -- mulching around leafy greens makes a real difference. Water in the morning so leaves dry during the day.
What happened: Heat and long days cause most leafy greens to bolt -- this is the most common reason they fail. The plant is not dying, it is doing what it is designed to do. Once bolted the leaves become bitter and inedible quickly.
Next season: The fall sowing is almost always more successful than spring for leafy greens. Cooling temperatures give you longer, slower-bolting plants. Shade cloth can also extend the spring crop by a couple of weeks.
Know what to look for before it gets out of hand — early identification is the most important step.
Free app · Kickstarter October 2027 · iOS February 2028
plant uses your ZIP code and real frost data to tell you the right day — not just the right month. Get notified when your planting window opens, when to succession sow, and when to cut back for next season.
Be first to back on Kickstarter · founding grower pricing locked in.
plant monitors these conditions and sends an alert the moment they are forecast for your location.
Traditional growers have used lunar cycles to time planting and harvest for centuries. The moon affects moisture levels in soil and sap flow in plants.
These guides get better when growers share what they know. If something's off or you've learned something worth passing on, add it here -- accepted tips earn you a Founding Grower badge when plant launches.
Your tip for growing Lettuce (Leaf)
Your name (optional)
Your zone
Your email (optional)
Tips are reviewed before publishing. Zone 9 tips appear on nearby zone pages too.
What needs correcting?
What should it say?
Your email (optional)