Houseplant care — As winter stretches on, take a quick check of your houseplants:
If there is a salty crust on the surface of the soil, remove it without taking more than 1/4 inch of the underlying media, Upham says. “This may also be a good time to repot the plant,” he writes in the Horticulture 2014 newsletter.
Because apple trees are tougher, the application can be delayed up to the green-tip stage, he says. Temperatures must be at least 40 degrees so the spray has a chance to dry before freezing, and spraying in the morning also helps ensure proper drying. If the spray does freeze before it dries, it can injure the plant.
Limbs, branches and twigs must be covered thoroughly for good control, and that is more easily done if the tree is pruned first, Upham says.