Harvest peas, raspberries, and all cool-season lettuces and vegetables as they ripen.
If squash vine borer has been a problem in your garden, cover small transplants of squash, cucumbers, and zucchini with row covers to prevent moths from laying eggs on vines. Remove row covers when plants begin to flower. Consider planting resistant varieties next year.
Pinch top growth of herbs to encourage branching and keep them from flowering. Snip or cut off sprigs of herbs to use in cooking all season.
A fascinating nature project for families is to plant dill or fennel to attract swallowtail butterflies to lay their eggs. Watch for tiny eggs to develop into plump caterpillars that will feed on the herb foliage before pupating into butterflies.
Plant pumpkins at the first of the month. Large varieties require a 100-day growing season. If you gently carve names in developing pumpkins, the letters will enlarge as pumpkins grow.
Stake or cage tomatoes and peppers as they continue to grow.
Mulch your vegetable garden with straw to retain moisture.