- Harden off, and then set out transplants of melons, tomatoes, peppers, cucumbers, eggplant, and squash.
- For a continuous crop of lettuce, radishes, and spinach, sow more seeds midmonth.
- Fertilize and water any potted vegetables regularly.
- Enjoy asparagus right in the garden—even uncooked, it’s delicious.
- Plant tender fuchsias, begonias, dahlias, and asters.
- Early in the month, finish setting out transplants of vegetables and flowers.
- Plant seeds of warm-weather crops, such as melons and squash.
- Sow more lettuce so you can keep harvesting leaves, even after the first crop goes to seed.
- Near month's end, plant cilantro to put in the salsa you'll make later.
- Stake or cage tomatoes and other veggies and flowers that tend to sprawl.
- Plant asters and pansies for fall bloom.
- Spray Bacillis thuringiensis (BT) on brassicas as soon as you spot cabbage moths.
- Mulch beds as soon as the soil warms up.
- Stake dahlias and gladiolas when you plant them to keep from damaging their roots later in the season.
- Pinch back foliage ends of mums, a ½ inch every 2 weeks.
- Fertilize roses now: To supply potassium, whiz banana peels in a blender, then plop the stuff beneath the mulch around your roses.
- Harvest daily from asparagus plants in patches at least 3 years old.
- For autumn harvest, plant bush beans, Brussels sprouts, and late cabbage.
- Spray tomato plants with compost tea (made by steeping an old pillowcase filled with compost in a bucket of water) to prevent diseases.
- Place supports for lanky perennials.
- Pinch back chrysanthemums to keep them bushy—a ½ inch from the growing tips, every 2 weeks until the middle of next month.
- Prune spring-flowering shrubs after they’ve finished blooming.
- Cage tomatoes, peppers, and eggplant.
- Replace finished lettuce with okra or a late crop of summer squash.
- Plant a few more runs of corn, beans, and cucumbers.
- Plant sweet potato slips early in the month.
- Inventory seeds for the fall garden.
- Plant pole, lima, and bush beans; winter squash; and luffa gourds.
- Start seeds for fall crops of eggplants, peppers, and tomatoes to set out in July.
- Cut and dry thyme, oregano, and mint.
- Replace bolted lettuce with corn, malabar spinach (Basella alba), winged beans (Psophocarpus tertragonolobus), and southern peas.
- Trap slugs with containers of fresh beer.
- Mulch to reduce weeds and watering later.
- Plant mums, balsam, cockscomb, wax begonias, salvia, dusty miller, blanket flower (Gaillardia spp.), geraniums, marigolds, verbena, and vinca (Catharanthus roseus).
- Plant bulbs or tubers of irises, cannas, water lilies, dahlias, and daylilies.
- Replenish mulches around plants to keep weeds down and conserve moisture.
- Plant a cover crop in vacant beds.
- Plant mustard and turnips for harvesting tender baby leaves.
- Work compost into beds, then plant fall crops of peppers and eggplant.
- Direct-seed collards and tomatoes for fall harvest.
- Continue planting cantaloupes, corn, cucumbers, okra, peanuts, southern peas, summer squash, sweet potatoes, and bush beans.
- Thin fruit trees early in the month; mulch root area with a thin layer of compost, topped with 3 inches of organic mulch.
- Look for slow-moving bugs in the cool of the morning; hand-pick them, then dust below the plants with Diatomaceous earth (a white powder made from the fossilized remains of diatoms, one-celled algae that have a skeleton made of silicon). Be sure to use a dust mask so you don't inhale the dust.
- Last chance to plant sweet potato slips and peanuts this season.
- Continue planting sweet corn in small blocks, every 2 weeks for continuous harvest through fall.
- Start more zinnias, marigolds, and sunflowers to replenish tired flowers in late summer.
- Water plants in the morning so they don't become susceptible to fungus and insect infestation.
- Plant more heat-tolerant veggies: Replace spinach with Swiss chard and potatoes with taro (Colocasia esculenta).
- Feed fast-growing bananas and summer-flowering perennials, such as hibiscus and ixora, with compost to prepare them for upcoming bloom.
- Clean up debris beneath mangoes to prevent anthracnose (fungal) disease; for bad infections, spray with copper solution.
- Prune cassia trees, royal poinciana, bougainvillea, and jasmine after they bloom.
- Prune tropical fruits after the harvest this month.
- Kill pests and disease in vacant beds by covering moist soil with clear plastic for several weeks.