Purple fountain grass (Pennisetum setaceum ‘Rubrum’) is a stunning ornamental grass that adds a touch of drama and elegance to any landscape. While it is generally considered hardy in zones 9-11, there are some cultivars that have shown greater cold tolerance and can survive in zone 5 with proper care.
In zone 5, winters can be quite harsh, with temperatures dropping well below freezing. This poses a challenge for many plants, including purple fountain grass, as they may not be able to withstand such extreme cold. However, there are a few steps you can take to increase the chances of survival for your purple fountain grass in zone 5.
1. Choose a cold-tolerant cultivar: Look for cultivars that are specifically bred to withstand colder temperatures. Some examples include ‘Fireworks’ and ‘Graceful Grasses Purple Fountain Grass’. These cultivars have been known to survive in zone 5 with proper winter protection.
2. Plant in a sheltered location: Select a planting site that offers some protection from harsh winds and cold temperatures. This could be near a building, a fence, or in a microclimate that tends to be slightly warmer than the surrounding area.
3. Provide winter protection: In late fall, before the first frost, cut back the foliage of the purple fountain grass to about 6 inches above the ground. This will help reduce the risk of winter damage. Next, apply a thick layer of mulch around the base of the plant to insulate the roots and protect them from freezing temperatures. Some gardeners also opt to cover the plant with a burlap sack or a frost blanket for added protection.
4. Monitor moisture levels: While purple fountain grass is drought-tolerant once established, it is important to keep the plant adequately watered leading up to winter. Well-hydrated plants are better equipped to withstand the stresses of cold temperatures.
5. Consider container gardening: If you are unsure about the hardiness of your specific purple fountain grass cultivar, you can always plant it in a container. This allows for more flexibility in terms of moving the plant indoors or into a protected area during the winter months. Just be sure to choose a container that is large enough to accommodate the plant’s root system and provide proper drainage.
It is worth noting that even with these precautions, purple fountain grass may still experience some winter damage in zone 5. However, with proper care and attention, it is possible to increase its chances of survival and enjoy its beauty year after year.
I have personally grown purple fountain grass in zone 5 and have had success with the ‘Fireworks’ cultivar. By following these tips and providing winter protection, I was able to see the grass come back strong and vibrant each spring. It added a beautiful splash of color to my garden and became a focal point of interest.
While purple fountain grass is generally considered hardy in zones 9-11, there are cold-tolerant cultivars available that can survive in zone 5 with proper care. By choosing the right cultivar, selecting a sheltered location, providing winter protection, monitoring moisture levels, and considering container gardening, you can increase the chances of your purple fountain grass surviving and thriving in zone 5.
