Indoor Coleus

Indoor coleus prefers consistent moist soil. The best way to check to know whether the soil is dry is by sticking your finger into the topsoil until you reach the second knuckle. During its growing season, the houseplant should be watered regularly. However, allow the surface of the soil to dry out in between waterings. Make sure not to overwater your indoor coleus, as this may cause root rot.

Indoor coleus thrives in sun or shade conditions, but does better in filtered light. It’s best to avoid extremely bright or direct sunlight. During the summer the plant should be placed in a shady spot and for conditions outside, some light shade. During the winter, Indoors this houseplant should positioned near a window so it can get indirect sunlight.

This houseplant prefers cool temperatures of between 60°F (15°C) – 75°F (24°C). Do not expose it to temperatures below 50°F (10°C). Keep humidity levels high in cooler climates with a humidifier or by frequent misting.

Indoor coleus likes humidity, but is not especially fussy about it. It prefers moderate humidity levels during its growing season, with additional misting during the winter months to keep the plant hydrated. To increase humidity levels, you can place it near a white pebble tray filled with water.

Indoor coleus prefers a well-draining potting soil. Choose a potting mix that is airy, light, and contains plenty of organic matter. A combination of peat, vermiculite, and perlite will provide adequate drainage and aeration for this houseplant.

Fertilize indoor coleus once a month during the growing season. Choose a balanced liquid fertilizer with an N-P-K ratio of 10–10–10. Always dilute the fertilizer by half the recommended dosage. Avoid over fertilizing as this can damage the houseplant's roots and lead to yellowing of the leaves.

Indoor coleus is susceptible to aphids, mealybugs, and spider mites. Watch for signs of infestation, including sticky leaves, yellow growth, or spots. As soon as you spot a pest problem, take steps to treat it immediately. Use an insecticidal soap or horticultural oil spray to get rid of pests. Additionally, you can also use neem oil or a neem-based insecticidal soap.

Repotting indoor coleus every two years will help extend its lifespan. It’s best to repot in early spring when the plant is in its active growing season. Use a standard potting soil mix and a pot that is two inches larger than the current one. Make sure the container's drainage holes are adequate.

Indoor coleus can get out of control if not pruned regularly. Prune your coleus as soon as you notice it starting to look leggy. Use pruning shears to trim the stem tips and remove any dead leaves. Prune back indoor coleus plants after each flush of blooms to keep them compact and bushy.

Mulching indoor coleus is a good way to retain moisture in the soil and prevent weeds from taking over. Mulch with organic matter such as compost, rotted leaves, or bark chips to help insulate the roots and keep them moist.

Indoor coleus can be propagated with stem cuttings in the summer months. Use a rooting hormone to increase the success rate. Take 3–4in cuttings from the tip of a stem and remove the lower leaves. Plant the cuttings in a sandy soil mix or in a moist propagation mixture and place them in a warm spot with indirect sunlight.

Indoor coleus plants can become top heavy and require support. Use a stake or a bamboo cane to provide additional support to the stems of the plant, especially as it gets taller.

Most indoor coleus houseplants should receive a rest period during the winter months. During this time, the plants will not produce flowers or new growth. Reduce the frequency of watering and place in an area with lower levels of light and humidity.

Indoor coleus is nontoxic to humans and pets; however, some animals may be tempted to chew on the colorful foliage. Ingesting the leaves could cause a mild digestive upset, so it’s best to keep pets and children away.