Blue porterweed is a low growing south Florida native that produces small blue flowers nearly year-round and is an excellent choice for attracting pollinators. It’s also great as a groundcover. Keep reading to learn more about using blue porterweed for ground coverage.
Blue Porterweed Groundcover Facts
Blue porterweed plants (Stachytarpheta jamaicensis) are native to south Florida, though they have since ranged throughout most of the state. Since they are only hardy to USDA zone 9b, they have not travelled farther north. Blue porterweed is often confused with Stachytarpheta urticifolia, a non-native cousin that grows more aggressively and should not be planted. It also grows taller, as high as 5 feet (1.5 m.), and woodier, which makes it less effective as a groundcover. Blue porterweed, on the other hand, tends to reach 1 to 3 feet (31-91 cm.) in height and width. It grows quickly and spreads out as it grows, making for an excellent groundcover. It is also extremely attractive to pollinators. It produces small, blue to purple flowers. Each individual flower stays open for only one day, but the plant produces such a large number of them that they are very showy and attract plenty of butterflies.
How to Grow Blue Porterweed for Ground Coverage
Blue porterweed plants grow best in full sun to partial shade. When they are first planted, they need moist soil but, once established, they can handle drought quite well. They can tolerate salty conditions too. If you’re planting them as groundcover, space the plants out by 2.5 to 3 feet (76-91 cm.). As they grow, they will spread out and create an attractive continuous bed of flowering shrub. Cut the shrubs back vigorously in late spring to encourage new summer growth. Throughout the year, you can prune them lightly to maintain an even height and attractive shape.
Gardening tips, videos, info and more delivered right to your inbox!
Sign up for the Gardening Know How newsletter today and receive a free download of our most popular eBook "How to Grow Delicious Tomatoes."
The only child of a horticulturist and an English teacher, Liz Baessler was destined to become a gardening editor. She has been with Gardening Know how since 2015, and a Senior Editor since 2020. She holds a BA in English from Brandeis University and an MA in English from the University of Geneva, Switzerland. After years of gardening in containers and community garden plots, she finally has a backyard of her own, which she is systematically filling with vegetables and flowers.
Which Types Of Wood To Use For Growing Fungi
Wondering about the best logs for mushroom plugs? Match the mushroom type to the tree variety for a great crop of delicious mushrooms.
By Bonnie L. Grant
Woodland Stumpery Garden Design – Working Wonders With Woodland Stumperies
Grow a beautiful woodland stumpery garden with woodland plants interspersed in, on and near tree stumps of all kinds and sizes.
By Teo Spengler