Plant annuals and perennials. Our hot and muggy June days are not the most plant-friendly environments, but you can still add annual and perennial color to your garden. Choose plants that are fairly bulletproof and designed to take the heat in stride, like native and adapted plants. Try salvia (Salvia greggii), Mexican bush sage (Salvia leucantha) and purple coneflower (Echinacea purpurea) for perennials, plus heatproof annuals like vinca, portulaca, begonias and impatiens. And be sure to plant in the early morning or late afternoon to avoid immediately stressing new plants with the midday sun. Stay on top of watering, and you're good to go.