Monthly Calendar of Activities
in your garden and landscape
Lawn: Aerate if water is running off rather than soaking
in. Brown patches are really showing up now; see May.
Roses: Keep fed and evenly moist. Cut buds early on hot
days as heat will blast the flowers. Keep hips (seed heads) removed.
Trees: Continue deep-root watering through the summer.
Mulching helps conserve moisture and keep roots cool.
Shrubs: See trees.
Annuals: You can still plant celosia and cosmos, and spot
in heat-loving flowers like vinca. Brighten shady areas with impatiens,
Perennials: Groom and water.
Vegetables: Last plantings of corn and beans. Harvest summer
vegetables regularly to keep them producing.
Weather notes: The greatest number of successive days over
100 degrees was in July, 19868 in a row.
Watering systems: See June.
Pests and diseases: Squash bugs and aphids on pumpkins,
squash. Whiteflies are starting to build up.
Shop now for... Crape myrtles, subtropicals.
Roses: Groom and water. Don't feed when it's really hot.
Trees: Deep-root water. Ask about "summer pruning"
of fruit trees. Feed
citrus and apply F.S.T. or sulfur.
Shrubs: Water. Feed acid loving plants and apply F.S.T.
Annuals: Pull annuals that are past their peak and spot
in more color as you do. Annual vinca is the queen of the sunny summer border.
Garden in the shade with impatiens and begonias.
Perennials: Divide bulbs and iris rhizomes.
Vegetables: Plant seeds of fall and winter vegetables later
in the month.
Watering systems: See June. Don't let the heat cause you
to water too frequently, but water thoroughly when you do.
Pests and diseases: Whiteflies, leafhoppers; rust.
Shop now for: Drip irrigation systems.
September and October
Lawn: Fertilize lawn with a regular lawn fertilizer. Renovate if heat breaks de-thatch,
Roses: Fertilize mid September to early October to get
a great fall bloom.
Trees: Fertilize deciduous trees.
Shrubs: Prune evergreen shrubs when heat breaks. Plant
landscape shrubs, trees, and ground covers. Move existing landscape plants.
Annuals: Start seeds or buy plants of pansies, violas,
snapdragons, calendula, stock, sweet alyssum, and more. Broadcast wildflower
Perennials: Lots of perennials can be started from seed
this month: foxgloves, candytuft, columbine, coral bells, dianthus, and
many more. Preemergents or mulches will help prevent annual winter weeds.
Cut back herbaceous (soft) perennials hard; lightly trim woody ones. Best
time for a major cleanup in the perennial border. Plant bulbs when soil
Vegetables: Plant broccoli, cauliflower, carrots, lettuce,
greens, peas, beets, onions, and more.
Weather notes: Hot, dusty, windy. Wash plant foliage early
in the day to remove dust and insects. Move indoor/outdoor plants back in
by Halloween. First cold rain usually mid-late October, but don't count
Watering systems: Set timer for fall schedule late this
Pests and diseases: Whiteflies, leafhoppers, spider mites.
Shop now for: Perennials in small packs and pots; spring-blooming
flower bulbs; landscape plants.
Lawn: Fertilize with a winter-type fertilizer. Still OK
to renovate early in the month.
Roses: Stop fertilizing.
Trees: Don't prune citrus now with frost coming
Shrubs: Don't prune evergreen shrubs nowthey won't
resprout until spring.
Annuals: See October.
Perennials: cyclamen, primulas; spring flowering bulbs.
Vegetables: Broccoli, cabbage, lettuce; onions and garlic.
Weather notes: First frost usually around Thanksgiving.
Move semi-tender plants under overhead protection.
Watering systems: Turn off once we've had an inch or two
Pests and diseases: Snails, slugs, caterpillars, aphids,
Shop now for: Berry plants.
Lawn: Fertilize with at winter-type lawn food now or in January.
Roses: OK to start pruning now. You can move
rose bushes when they are dormant, now through mid-February.
Trees: OK to start pruning deciduous trees. Ask for advice!
Shrubs: Hardy evergreen shrubs can be pruned, but they won't regrow until spring. Deciduous flowering shrubs should not be pruned until after they bloom.
Annuals: Plant pansies and violas, snapdragons, calendulas, stock, sweet alyssum. Primroses provide quick, bright color.
Perennials: Plant cyclamen for quick color. Dianthus may be blooming and can be planted now. Plant your
bulbs by mid-January!
Vegetables: Look for perennial vegetables: artichoke, asparagus,
rhubarb. You can still plant winter greens, onions, garlic, shallots, and more.
Weather notes: An early freeze such as we had in Dec. 1990
(16 degrees!) would be highly destructive. Listen to weather forecasts carefully
and get advice on how to protect semi-tender plants.
Watering systems: Probably time to turn them off. Water plants in containers and under roof overhangs as needed.
Pests and diseases: Check plants that you brought indoors
for aphids, mites, mealybugs, scale insects. Most can be managed with a thorough spray of water. Give 'em a shower!
Shop now for: Gifts for gardeners and yourself, living
Christmas trees, fresh garland and wreaths, holiday plants.
© 2023 Don Shor, Redwood Barn Nursery, Inc., 1607 Fifth Street, Davis, Ca 95616
Feel free to copy and distribute this article with attribution to this author.