Blue plumbago is a sprawling, shrublike perennial bloomer valued for the mounds of intensely coloured, sky-blue blooms. Depending on the variety, blue plumbago can reach heights of 3 to 10 feet, although most types are limited to 3 to 4 feet. Blue plumbago is durable enough to tolerate hot, dry summers and will bloom profusely until the first frost. A warm weather, deer- and pest-resistant plant, blue plumbago is suitable for planting in U.S. Department of Agriculture hardiness zones 8b to 11.
Plant blue plumbago in full sunlight and well-drained soil. Although blue plumbago is adaptable to partial shade, blooming will be limited.
Keep the soil evenly moist until blue plumbago is established. After that time, blue plumbago is moderately drought tolerant, but will benefit from regular watering during hot, dry summer weather. Water blue plumbago deeply enough to saturate the root zone, then allow the soil to dry before watering again.
Feed blue plumbago once every month during spring and summer. Apply a general purpose liquid fertiliser according to specifications on the label. Always water immediately after feeding.
Clip wilted flowers to promote continued blooming throughout the season. Allowing the flowers to remain on the plant will cause the plant to go to seed early and blooming will decrease dramatically.
Prune blue plumbago in late winter to keep the sprawling plant neat and compact. Don't be afraid to prune drastically, as blue plumbago tolerates pruning well and will respond by flowering profusely.
Things you need
- General purpose liquid fertiliser
- Garden pruners
- Texas A&M University Extension; Blue-Blooming Vitex and Plumbago: Butterflies Love 'Em, Deer Don't; Jerry Parsons
- Texas A&M University Extension: Plumbago Cape Plumbago
- University of Illinois Extension; Plumbago; Jennifer Schultz Nelson; July 2007
- Floridata; Plumbago auriculata; Jack Scheper; December 1996
- EasyBloom: Leadwort: Escapade Blue (Plumbago)