What to plant in Castille and León in September
September in Castile and León brings mild daytime conditions (average high of 20.9°C) and cooling nights falling to 9.4°C, marking the transition to autumn. With winter cold arriving rapidly in November, this month is the critical window to sow fast-maturing cool-season greens, root crops, and hardy brassicas, or transplant pre-grown starts for late autumn and overwinter harvests.
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Semis
Semis recommandé
Spinach
Direct sow outdoors; established plants will tolerate the dropping temperatures in October and November.
Radish
Sow in shallow furrows outdoors for a quick autumn crop ahead of late-season rains.
Arugula
Direct seed into open beds; leaf quality is high under declining temperatures.
Lamb's Lettuce (Corn Salad)
Direct sow outdoors; slow initial growth but persists well through Castilian winters.
Turnip
Sow directly in loose soil; thin early to ensure root expansion before November chills.
Carrot
Sow directly outdoors; germination requires continuous surface moisture during warm September afternoons.
Swiss Chard
Direct sow or start in seedbeds; seedlings will establish before October temperatures dip.
Winter Lettuce
Direct sow outdoors early in the month to allow rosettes to form before sunlight hours drop.
Plants
Plants
Broccoli
Set out 4-6 week-old starts immediately in firm, nutrient-rich soil.
Cabbage
Transplant pre-grown seedlings early in the month so root systems establish before November's sharp temperature decline.
Cauliflower
Transplant established starts to open beds; ensure no water deficits during root establishment.
Leek
Transplant pencil-thick starts deeply into trenches or holes to blanch stems.
Tasks
Monthly tasks
Clear spent summer crops to reduce pest carryover and make room for autumn beds. Incorporate compost into planting zones ahead of October rains (historical average of 97.5mm). Mulch around newly planted seedlings to regulate soil moisture against daytime highs of 20.9°C while insulating roots as nighttime temperatures dip toward 9.4°C.