Sow
Sow another small batch of basil and heat-tolerant salads in a cooler spot. Check that sowing dates suit the variety.
Grow
Tie in cordon tomatoes, remove their small side shoots and leave bush varieties to branch. Begin feeding fruiting crops as their instructions recommend.
Harvest
Pick cucumbers while young and tender, and harvest early tomatoes when fully coloured. Pick herbs regularly without stripping plants.
Jobs this month
Check compost daily, sometimes twice in hot weather. Ventilate, inspect leaf undersides and test irrigation rather than assuming it works.
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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