Plant sweet corn anytime in May. Early May sowing is fine for asters, alyssum, calendula, centaurea, viola, scabiosa, mignonette, dianthus, cosmos, snapdragon, gypsophilia, nasturtium, phlox, and verbena. Green beans can be planted around the 10th.
If you want to plant lettuce, consider varieties like Ruby, Matchless, or Oak Leaf. They are slower to bolt in June heat. At lower elevations of southern Idaho, plant squash seeds beginning the second week of May. Tomato, pepper, and eggplant seedlings can be set out beginning the 15th. Be ready to cover them at night in case of frost.
Plant seeds of heat–loving plants like melons on the 22nd or later. All tender plants can be sown at that time. Keep seeds continually moist, but not soggy, until seedlings are up. Consider using a mulch to cut down on watering and weeding.
Warm days at the end of May make lawns thirsty. Most grasses need one inch of water per week and more in the hottest weather. 1/2 inch of water twice a week is better than small sips daily.
The first two weeks of June are not too late to plant warm season vegetables and fruits such as tomatoes, peppers, eggplant, corn, beans, and melons. Most of them will provide a reward for your labor before frost.
Set the lawn mower to one notch below its maximum height as hot weather approaches. Taller grass survives the heat better and can shade out lawn weeds.

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