Glencairn September 2018

Time now to make plans for fall landscaping projects.
• Clean up flowerbeds of fallen foliage, yellowed leaves and dead wood. Light green leaves
may signify lack of iron (chlorosis). Correct with iron cheleates.
• Cut off old dead foliage on irises. Scratch in a little bone meal around the roots.
• Prune roses to reshape and groom plants for fall growth. Follow up with a dose of fertilizer
the first week of September.
• Plants come out of summer rest and go crazy. Insect populations explode as we get into
cooler temperatures. Diseases that have been dormant wake up.
- Citrus, croton, avocado and mango are susceptible to spider mites and thrips. Discourage
them with a strong jet of water from a hose directed to the undersides of the leaves.
- Hibiscus, citrus, palms, gardenia and ixora are susceptible to scale and mealybug.
• Winter vegetable gardens and perennials get planted.
• Wait until November to plant petunias and pansies.
• Fire ants baits should be put out in September-October to lessen the number of eggs
that make it to Spring.
• St. Augustine grass gets its fall fertilizer during September. Continue to mow at maximum
height. You want to leave a lot of leaf surface to produce carbohydrate reserves for
the winter.
• Keep an eye out for sod webworms. First sign of them is grass that appears to stop growing.
You need to get them early for biological controls to work. When the caterpillars are only 1/4
inch, Bacillus thuringiensis applications can slow them. Bt is a bacteria that works on the caterpillars’
digestive systems and makes them stop feeding. Do the application late in the day.
The larvae feed at night and you want them to get nice fresh Bt.
• When the heat and drought end, the weather could bring brown patch disease in the St.
Augustine grass. Watch for yellowish spots if the nights drop into the 60’s and days stay
in the 80’s.
• Get any pruning of hedges and such done now. You want the flush of new growth to be
hardened-off before the end of October. Tree pruning should be put off until winter, when
the trees are dormant.
• Pre-emerge herbicide applications targeting annual bluegrass and the earlier-germinating
winter broadleaf weeds needed to be put out starting in mid-August.
September
Gardening
Tips
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8 September 2018 | Community Newsletter