Lawn & Garden FAQ
The leaves on my plants are turning yellow with black spots. What causes this problem, and what can I do about it?
It sounds like your plant may be suffering from a leaf spot fungi. To treat the problem, you should remove affected leaves and apply a fungicide. Be sure to follow all safety precautions and label recommendations.
To find out which fungicides will work best on your plants, contact or visit your county Extension office.
Applying botanical insecticides, horticultural oils, and insecticidal soaps to your plants can deter hungry insects. For more detailed information, read the articles Insect Management in the Home Garden and Natural Products for Insect Pest Management.
If you need help choosing the right treatment for your plants or locating the recommended products, contact your county Extension office.
The best defense against weeds is a healthy lawn, so try to keep your lawn happy by watering, mowing, and fertilizing appropriately. (For more information, read the Lawn Care topics.) However, some degree of weed control is often needed despite your best efforts.
Preemergent herbicides containing pendimethalin are typically the most effective way to control crabgrass, and the best time to apply these herbicides is in the spring (early February for South Florida, mid-February for Central Florida, and early March for North Florida). Be sure to follow all directions and safety precautions whenever you apply chemicals.
The University of California's Crabgrass publication describes cultural practices that can help control crabgrass, including hand pulling and solarization, which will kill living crabgrass but not seeds.
To learn more about controlling crabgrass and applying herbicides, visit your county Extension office, where you can talk to horticulturists and master gardeners who have specialized knowledge of your local area.
My tree is covered with these small gray plants that seem to be killing it. What can I do?
Those gray plants are commonly known as air plants or bromeliads and are generally harmless to trees. These unique plants are "epiphytes", which means they gather moisture and nutrients from the air instead of from the soil. They simply need the trees for support, much like the way birds use trees as a place to build their nests.
Over a dozen species of air plants are native to Florida, and many--including the well-known Spanish moss--fall under the scientific genus Tillandsia. You can view photos of native air plants at the Bromeliad Biota website.
Although air plants look gray, they still contain chlorophyll and photosynthesize like other plants. The gray color comes from fine scales that cover the plant’s thin leaves and help it to trap moisture. When wet, the plant’s green color shows through the scales.
Again, air plants are typically harmless and cause problems only when present in great numbers, which in rare cases may lead to limb breakage. If your tree looks sick, ask your county Extension office for help.
Can I grow hot peppers at home?
Our Disaster Preparedness & Recovery page provides general information about disaster preparedness, including links to hurricane-specific websites and publications.
How should I prune my trees in preparation for hurricane season?
The Department of Environmental Horticulture offers a thorough online guide to preparing your trees for severe weather, including pruning information.
Visit the Department of Environmental Horticulture's InfoCenter. For landscaping information, read Principles of Landscape Design or our online guide to shade tree maintenance. For general information about home landscapes and gardens, visit our Lawn & Garden section.
Visit UF/IFAS' Residential Landscapes website to get research-based information about home lawn care. If you still have specific questions, contact your county Extension office and ask for a volunteer Master Gardener or county horticulture agent.
For the most part, homeowners do not need a license to buy and use chemical pesticides, as long as they buy the product themselves, use their own equipment, and apply it only to their own yard. In all cases, the label is the law--read and follow ALL label instructions. If you need help identifying a pest or finding the right pesticide, contact your county Extension office.
If your pest problems require materials that you can not buy without a license, you should contact a pest control operator (check your local phone book listings). Please read our homeowners guide to pesticides for more information.
Agricultural producers or others who wish to get a commercial pesticide applicator license can check the ProHort website for information. UF/IFAS’ Pesticide Information Office maintains a document entitled Pesticide Applicator License Categories, Examinations, and Reference Materials (pdf). Your best bet may be to contact your county Extension office.
Florida pesticide applicator licenses have to be renewed to stay valid. Applicators can re-take the pesticide licensing test or attend classes to earn Continuing Education Units (CEUs) to renew their licenses. To take a test, contact your county Extension office.
To find out what CEUs you need for a particular license, contact your county Extension office or visit to the ProHort website. To find out where upcoming classes are being held, visit the Florida Department of Agriculture's Pesticide Certification & Licensing page.
I want to teach children about vegetable gardening. What can you tell me about transplanting and plant care that would be useful for adults and children?
How can I establish a community vegetable and/or flower garden as a community development or volunteer project?
At your county Extension office, you can find professional horticulturists on staff, as well as volunteers who have been certified as Florida Master Gardeners. These volunteers often get involved with community projects, sharing their gardening expertise with others who wish to learn.
You might also enjoy our publication, Starting a Community Garden.
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