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Your gardening tasks for July


Category
Week
Activity
 
1
2
3
4
 
Ornamentals x x x x Provide water in the garden for the birds, especially during dry weather.
  x x x x Remove infected leaves from roses. Pick up fallen leaves. Continue fungicidal sprays as needed.
  x x x x While spraying roses with fungicides, mix extra and spray hardy phlox to prevent powdery mildew.
  x x x x Newly planted trees and shrubs should continue to be watered thoroughly, once a week.
  x x x x Fertilize container plants every 2 weeks with a water soluble solution.
  x x x x Keep weeds from making seeds now. This will mean less weeding next year.
  x x x x Keep deadheading spent annual flowers for continued bloom.
  x x x x Perennials that have finished blooming should be deadheaded. Cut back the foliage some to encourage tidier appearance.
  x x o o Plant zinnia seed by July 4th for late bloom in annual border.
  x x o o Spray hollies for leaf miner control.
  x x o o Prune climbing roses and rambler roses after bloom.
  x x o o Apply final treatment for borers on hardwood trees.
  x o o o Apply no fertilizers to trees and shrubs after July 4th. Fertilizing late may cause lush growth that is apt to winter kill.
  x o o o Hot, dry weather is ideal for spider mite development. Damage may be present even before webs are noticed.
  x o o o With spider mite damage, leaves may be speckled above and yellowed below. Evergreen needles appear dull gray-green to yellow or brown.
  o x x o Fall webworms begin nest building near the ends of branches of infested trees. Prune off webs. Spray with B.T. if defoliation becomes severe.
  o x o o Divide and reset oriental poppies after flowering as the foliage dies.
  o o x x Semi-hardwood cuttings of spring flowering shrubs can be made now.
  o o x x Summer pruning of shade trees can be done now.
  o o x o Powdery mildew is unsightly on lilacs, but rarely harmful. Shrubs grown in full sun are less prone to this disease.
  o o o x Divide bearded iris now.
  o o o o Don't pinch mums after mid-July or you may delay flowering.
Lawns x x x x Water frequently enough to prevent wilting. Early morning irrigation allows turf to dry before nightfall and will reduce the chance of disease.
  o o x x Monitor lawns for newly hatched white grubs. If damage is occurring, apply appropriate controls, following product label directions.
Vegetables x x x x Blossom-end rot of tomato and peppers occurs when soil moisture is uneven. Water when soils begin to dry; maintain a 2-3 inch layer of mulch.
  x o o o To minimize insect damage to squash and cucumber plants, try covering them with lightweight floating row covers. Remove covers once plants flower.
  o x o o Dig potatoes when the tops die. Plant fall potatoes by the 15th.
  o o x x For the fall garden, sow seeds of collards, kale, sweet corn and summer squash as earlier crops are harvested.
  o o x x Set out broccoli, cabbage, and cauliflower transplants for the fall garden.
  o o x o Sweet corn is ripe when the silks turn brown.
  o o x o Keep cukes well watered. Drought conditions will cause bitter fruit.
  o o x o Harvest onions and garlic when the tops turn brown.
  o o o o Sow seeds of carrots, beets, turnips, and winter radish for fall harvest.
Fruits x x x x Cover grape clusters loosely with paper sacks to provide some protection from marauding birds.
  x o o o Prune out and destroy old fruiting canes of raspberries after harvest is complete.
  x o o o Blackberries are ripening now.
  o x x o Apply second spray to trunks of peach trees for peach borers.
  o o x x Early peach varieties ripen now.
  o o o x Thornless blackberries ripen now.

Missouri Botanical Garden, 2001-2011