As the temperatures start to drop and winter approaches, it's time to think about protecting your beloved coleus (Plectranthus scutellarioides) plants. While coleus are known for their vibrant foliage and can be grown as perennials in warm climates, they are typically grown as annuals in colder regions. Here's a comprehensive guide on how to cut back coleus for winter to ensure their survival and a beautiful display next spring.
Understanding Coleus' Winter Hardiness
Coleus plants are native to tropical regions and are not frost-tolerant. They typically cannot survive temperatures below 50°F (10°C). Therefore, it's crucial to prepare them for winter, especially if you live in USDA hardiness zones 6 and below. In this zone, the average minimum winter temperature is below 0°F (-18°C), which is too cold for coleus.
When to Cut Back Coleus for Winter
Timing is crucial when it comes to cutting back coleus for winter. The ideal time to do this is when the plant starts to show signs of stress due to the dropping temperatures. This usually happens in late summer or early fall. However, it's essential to keep an eye on the weather forecast. If a sudden cold snap is expected, you might need to cut back your coleus earlier than usual.
How to Cut Back Coleus for Winter
Step 1: Choose the Right Tools
To cut back your coleus, you'll need a clean, sharp pair of pruning shears or scissors. Using clean tools helps prevent the spread of diseases. Sharp tools ensure clean cuts, which help the plant heal faster.
Step 2: Determine How Much to Cut
When cutting back coleus for winter, you should aim to remove about one-third to one-half of the plant's height. This might seem drastic, but it helps the plant focus its energy on producing strong, healthy growth next spring.
Step 3: Make the Cut
Find a set of leaves that are growing in the opposite direction to the ones you want to remove. This is where your new growth will come from. Make your cut just above this set of leaves. Be sure to make the cut at a 45-degree angle to encourage new growth.
Caring for Coleus Over Winter
After cutting back your coleus, it's essential to provide them with the right care over winter to ensure their survival.
Indoor Care
- Light: Place your coleus in a bright, indirect light. They need at least 6 hours of light per day.
- Temperature: Keep your coleus in a room where the temperature stays between 65-75°F (18-24°C).
- Water: Water your coleus when the top inch of soil feels dry. Reduce watering during winter as the plant is dormant.
Outdoor Care
If you live in a mild winter climate (USDA hardiness zones 9-11), you might be able to overwinter your coleus outdoors. To do this, provide your plants with some protection from the cold. This could be a cold frame, a greenhouse, or even a thick layer of mulch.
Reviving Coleus in Spring
Once spring arrives, it's time to start thinking about reviving your coleus. This involves gradually acclimating your plants to outdoor conditions and encouraging new growth. You can do this by gradually increasing the amount of time your coleus spends outdoors each day.
Remember, it's normal for coleus to look a bit worse for wear after winter. Don't worry if your plants look a bit leggy or have lost some of their vibrant color. With the right care, they'll soon be back to their beautiful best.
In conclusion, cutting back coleus for winter is a crucial step in ensuring their survival and a beautiful display next spring. With the right timing, tools, and care, you can successfully overwinter your coleus and enjoy their vibrant foliage for many years to come.
