July–August for a simple autumn routeStart briefly under cover in modules; provide light and avoid heat.
- Germination and temperature
- Raise in cool to mild conditions; avoid severe cold, heat and drying out.
- After emergence
- Keep emerged lettuce bright and well ventilated; prevent high greenhouse temperatures and drying out.
- Pricking out and potting on
- Sow in modules or prick out manageable seedlings into individual cells. Keep the root ball intact when planting out.
- Hardening off and planting out
- Gradually acclimatise indoor-raised plants to sun, wind and outdoor temperatures; shelter them again on cold nights. Plant out sturdy young plants; keep the growing point clear and protect against slugs and snails.
These leafy crops can bolt under stress or unsuitable day length. Use early sowing only with an appropriate cultivar.
Sources and use
RHS · sla ↗Britse teeltrichtlijn voor een gematigd klimaat; de genoemde perioden zijn richtlijnen voor Nederland en Vlaanderen.
Royal Horticultural Society · Mizuna en mibuna kweken ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
University of Maryland Extension · Groenten in potten en saladetafels, inclusief mizuna ↗Soort- of productgebonden bron; buitenlandse perioden zijn geen vaste Nederlandse zaaidatum.
Guideline periods for the Netherlands and Flanders. Check the variety, available light, soil and measured temperatures. Greenhouse heating does not guarantee enough winter light.