UC Master Gardeners, Santa Clara County, CA
University of California
UC Master Gardeners, Santa Clara County, CA

Water Wise Plants

Lobelia laxiflora

lo-BEE-lee-ah laks-ih-FLO-ruh
Common Name
Mexican Lobelia
Plant Type
Mature Size
3 ft. to 6 ft. wide and 3 ft. tall
Water Requirements
Low: water every three weeks until the root ball is wet
Sun/Shade Requirements
Full to half sun
Flower Color
Red with yellow tips
Maintenance- Design- Planting Tips

Many Lobelias need lots of water, but not this lovely red Mexican lobelia, which has done well in our low water garden. It blooms all summer!

Though very frost tender, Mexican lobelia comes back from the root stock in the spring and spreads vigorously. After frost damage, we prune some of the scragglier branches back to about three feet to make the plant look neater. When danger of frost is gone we prune the plant to the ground to encourage new growth.

Mexican lobelia has spread aggressively in our garden and needs regular root pruning to keep under control. We would not recommend this Lobelia for someone looking for a low maintenance plant.

Warning: Lobelia may cause serious illness or death if eaten. If ingested, immediately call the Poison Control Center or your doctor. In addition, the juice or sap of the plant can cause a skin rash or irritation. Wash the affected area of skin with soap and water as soon as possible after contact.

Top of page

Webmaster Email: webmaster-mgsantaclara@ucanr.edu