Planting
Bearded Iris may be divided and replanted when they have finished blooming. Discard all shriveled and diseased parts
Sow seeds of Hollyhocks, English daisies, Foxgloves, Violas, Canterbury bells, and Sweet William into the garden now for next year's bloom.
Geranium cuttings may be made in late July to start plants for indoor bloom during the winter months, and for setting into the garden next spring. You may need to provide supplemental lighting with fluorescent grow lights for really good winter blooms indoors.
Pruning
Summer blooming shrubs should be pruned for shape after they have finished flowering. Remove any dead or diseased branches.
Lawn Care
Raise the cutting height of the mower. Taller grass cools the roots and helps to keep the moisture in the soil longer.
Avoid using fertilizers in hot, dry weather.
General
Be alert to snail and slug damage. These creatures will be hiding during the heat of the day, but will come out of hiding in the cool morning and evening hours or after a rain.
Keep the weeds pulled, before they have a chance to flower and go to seed again. Otherwise, you will be fighting newly germinated weed seed for the next several years.
Continue to dead head (remove dead flowers) your annuals to encourage continued blooming. If your annuals have died off, pull them out and add them to the compost pile. Replant that spot with hardy annuals or perennials, such as Pansies or Calendulas. Get a second bloom from faded annuals by cutting them back to one half their height, then fertilize them with a liquid 5-10-10 fertilizer.
Fertilize container plants regularly with a liquid all purpose plant food.