Tropical plants, like crotons or succulents, crave constant humidity, especially in the dry, cool months. Keep ‘em quenched by building a DIY humidity tray. Line a waterproof metal or plastic tray with pebbles, and fill with water until stones are almost submerged. Place your pots on top. The evaporation will keep leaves healthy and help deter pests. Refill whenever you see the water line dipping low.