Even though it is still hot, the days are now growing shorter, and your trees and shrubs will be giving one final push of rapid growth before they prepare for winter dormancy. Keep this in control by pruning as necessary, but try not to reduce trees or shrubs by more than 20% at this time. Over pruning will signal the plant to push out an excessive amount of tender new growth. This will stress the plant or tree out in a time where it should be building reserves for the winter. Also, new growth will be susceptible to early frost if we get it in November. Keeping plants irrigated is a gardener's most important task this month. Vulnerable container plants may need a daily soaking. Shallow-rooted plants like avocado and citrus need to be watered more frequently as well. Established shrubs, perennials, and shade trees will benefit from a slow, deep soak. In addition, mist plants with a hose occasionally to keep foliage clean and wash away pests like spider mites. Just make sure to do this in the early morning or early evening, and not in the heat of the day. Cut back spent hydrangeas, but not too hard; leave at least three buds per stem for next year's blooms. Vegetable gardeners can start germinating broccoli, brussels sprouts, cabbage, cauliflower, collard, kale, mustard greens, and other Brassica seeds now. Just keep them protected from the summer heat, and well watered.
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