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Southern California Gardening Guide
for the
Month of August

August's heat won't let you forget that it's Summer but your eye should be on Fall. In many parts of the country, Fall is a period of winding down in the garden. But here in Southern California, it's just the beginning and August is the month to prepare for it. As in July, first pay close attention to the watering needs of your garden and then break out the seeds.

As unlikely as it may sound, August is the best time to plant seeds for annual and biennial flowers and cool-season vegetables. If you plant seeds now, you can take advantage of the warm soil (most seeds germinate slowly or not at all in cool soil) and by October, the prime Fall planting time, the seedlings will be ready to transplant into the garden. Another added bonus... if planted now, biennials and perennials that normally bloom the second year in cooler climates will bloom their first spring in Southern California.

Tall bearded irises need dividing about every three years and August through September (when the rhizomes are dormant) is the time to divide. This is also the time to buy and plant bearded irises. Iris rhizomes begin arriving in nurseries in August and many iris societies have their yearly plant sales at this time. Irises are one of the best perennials for Southern California, lovely to look at, easy to grow, and drought resistant. Check out your local iris society sale (If you're in San Diego try the "San Diego/Imperial County Iris Society Plant Sale").

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New Plantings

 Sow seeds of cool-season vegetables such as broccoli, brussels sprouts, cabbage, cauliflower, celery, kale, kohlrabi, mustard, lettuce and other greens and edible-pod peas. Plant radishes, carrots and beets directly into the garden.

 Sow seeds of cool-season annuals. This includes calendula, cineraria, dianthus, delphiniums, Iceland poppies, nemesia, pansies, snapdragon, stock, sweet peas, and many others.

 Sow seeds of biennials now for blooms next spring. Try foxglove (Digitalis), Canterbury bells (Campanula), and hollyhocks (Alcea).

 Tip for seed germination in hot weather: Keep seed flats in semi-shade and cover with plastic till seeds germinate. Remove plastic and gradually move into increasing light over a two to three week period until they're in full sun.

 Plant bearded iris rhizomes in areas that get at least a half-day of sun. In hot inland areas, lightly bury rhizome tops to prevent sunburn. Closer to the coast, plant rhizomes so the tops show slightly above the soil surface.

Garden Maintenance

 Cymbidiums This is still the cymbidium rapid growth period. As in July, continue to feed with a high nitrogen fertilizer.

 Daylilies. Clean up daylilies now by removing stems that have bloomed. The stems on most daylilies go brown after flowering; simply yank these off. However, on some varieties, the stems stay green and continue to grow; don't try to yank these off. After these green stems have finished flowering, they sprout leaves and form plantlets. Once these pups have formed one or two short roots, cut off the stems. Gently snap off the pups for planting.

 Fuchsias. Most fuchsias look bloomed out and shabby by August. Cut them back lightly, pinch the tips for a week or two and you'll get another flush of blooms that will last till the cold weather sets in. Cuttings from this new growth will root quickly.

 Roses. Remove spent flowers and hips. Prune very lightly to stimulate fall flowering. However, in hot inland locations, gardeners should probably wait another month, until temperatures slacken, before pruning. Keep plants heavily mulched and water deeply and regularly.

 Vegetables. Keep up with the harvest. Pick summer vegetables frequently, whether you use them or not, to encourage plants to continue producing well into Fall. Watch out for watermelon-size zucchini; Fast-growing cucumber, squash, and zucchini plants can be harvested almost daily.

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