A: An excellent question! The reason for the temperature warning is that plants cells are growing rapidly in the heat and thus are more likely to be affected by chemicals. General grass health and stress also determine if a weed killer will cause damage. Applying in the morning, when it's going to be hot soon, is not a good idea. Better to spray the chemical in the evening, when temperatures are falling.
Q: I recently purchased a Teddy Bear magnolia in a three gallon container. It’s gotten so hot, I wonder if I should keep it in the container or plant it. — Ann Walker, e-mail
A: I think there will be more stress on the magnolia growing in the pot than in the ground. Loosen a wide area around the planting spot, untangle the roots as you plant, apply mulch 3 feet from the trunk in all directions and resolve to give it 10 gallons of water once per week in the absence of rain. No vacations for you this summer!
Listen to Walter Reeves from 6 to 10 Saturday mornings on WSB-AM (750). Go to Gardening in Georgia for details on his TV show or visit his Web site, Walter Reeves .