Sow
Make a later sowing of cucumbers if needed and sow basil in warmth. Start a small salad batch where it will not overheat.
Grow
Plant tomatoes and cucumbers into their final positions once conditions are reliably suitable. Follow variety spacing and support climbing plants immediately.
Harvest
Harvest spring lettuce and radishes to free borders for summer crops. Pick before plants bolt in rising heat.
Jobs this month
Open vents early, secure shading when needed and keep water available. Water at the roots and inspect new plants before bringing them inside.
Make your own growing notes
Record what you sowed, your overnight minimum temperature and how the plants responded. Check the compost below the surface before watering: the same calendar date can bring very different conditions from one year to the next. Use the seed packet’s variety-specific guidance alongside this monthly plan.
For tender crops, distinguish the warmth needed for germination from the conditions needed after seedlings emerge. For winter leaves, choose varieties intended for the season and allow for slower growth as daylight falls.
Further reading: RHS greenhouse vegetable growing.
What’s happening in your greenhouse?
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