When it’s unusually hot, your plants will be extra thirsty, so don’t skip watering during a heat wave! Because extreme temperatures can impair plants’ ability to take up water via their roots, it’s also important to give them a helping hand by watering deeply. Water at the base of each plant, using a hose or watering can, and strive to avoid overspray on leaves. When the mercury rises, keep an extra close eye on your container plants. Potted plants are the first to suffer in a heat wave and will need more water than in-ground greenery.