Gardening in September
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Cooler nights with warm days are typical in September. After this hot summer we can expect the garden to need some attention this month.
Most perennials will be showing signs of stress and need to be cleaned up and cut back. Remove dying or diseased foliage. Spring blooming perennials can be cut back one last time and fertilized this month in preparation for their flowering cycle next year. Divide summer blooming bulbs and tubers such as iris and daylilies this month to rejuvenate them and create more plants next year. Feed winter blooming shrubs like azaleas and camellias with acidic fertilizer and keep them well watered. You can start to disbud camellias now for larger blooms. Check perennial ornamental grasses for signs of new growth as an indicator that it is time to cut them back
There still may be a few weeks before there is any rain so even established shrubs might need a deep soak to hold them over until there is any significant rainfall. Even native plants may need a deep soak to keep them alive. A good hosing off will be welcome by most plants that may be covered with dust and debris.
Although next month is when the main fall planting is done, towards the end of this month some things can be planted. There is still time to put in tropical plants like bougainvillea or lantana, just be sure to keep them well watered until they are established.
Clean out the ground in flowerbeds and apply mulch to control disease and weeds from popping up when it does start to rain.