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• Repot houseplants in new soil.
• Keep harvesting cool-season crops like asparagus, peas, and spring lettuce.
• Divide crowded perennials and share.
• Lantana, red bird of paradise, Oleander, and other winter damaged plants may be emerging at this time. Do not remove them prematurely. These plants will emerge if watered occasionally during winter.
• Deadhead spring-blooming bulbs, but let the foliage grow until it yellows.
• Plant heat-loving vegetables such as tomatoes, hot peppers, okra, and sweet potatoes.
• Finish up any pruning this month with the exception of spring-blooming trees and shrubs. You can prune them immediately after they're done flowering.
• Start warm-season melons and squash indoors, to transplant after Memorial Day, when the squash borer has moved on.
• Plant or transplant trees and shrubs before the heat of summer.
• Deadhead and begin replacing pansies and primroses as the blossoms fade.
• Divide most perennials as long as they're not spring bloomers and as long as the foliage isn't more than 5 or 6 inches high.
• Rip out invasive plants while the soil is damp, before they spread even further.
• Keep a sharp eye out for fungal problems during the rainy season.
• Finish planting new citrus trees and berry bushes for a late harvest.
• Watch for asparagus beetles, aphids, cabbage worms, cutworms, scale, slugs and snails, and any signs of fungal diseases (leaf spot, mildew, rust, etc.).