When a plant isn’t getting enough light, it may start to get lanky, with extra long stems as it tries to stretch to get as much light as it can,” explains Justin Hancock, horticulturist at Costa Farms, one of the largest growers of indoor plants in the US. You might also notice that it leans severely to one side as it tries to soak up every ounce of sun possible. When plants aren’t getting enough light, Hancock says you may notice the leaves start to go yellow and that the plant grows more slowly than it did previously. Flowering plants probably won’t bloom, and foliage won’t be so pretty either. “Some variegated or colorful-leaf plant varieties may also lose their variegation or color,” he says. “For example, ‘Pink Star’ earth star (cryptanthus) has brilliant pink foliage in high light; in low light, its leaves are green. Most crotons (codiaeum) won’t show off flamboyant shades of red, orange, yellow, or purple in their leaves if they’re not getting enough light.