Justacia, Shrimp Plant
The genus Justicia includes approximately 300 species from the family Acanthaceae.
Common Name: Shrimp plants
Appearance: Herb-like small shrubs.
Flowers: Small attractive tubular flowers enclosed in colourful overlapping bracts. Differs only slightly from Pachystachys in that staemens are located at the base of the corolla tube.
Features: Good for hedging and mass display.
Requirements: Keep soil fertile and moist. A neutral pH is preferred. Tropical to warm temperate conditions. Full sun to part shade.
Culture: Prune to encourage dense habit and to remove spent flowers. Fertilise and water regularly.
Pest & Disease: Scale, mealy bug, leaf eating insects, aphids. Use systemic chemicals for sap sucking insects, and contact insecticides for most other insects.
Species & Varieties:
J. adhatoda (syn. Adhatoda vasica) -An evergreen shrub to 3m tall with white flower with purple markings borne in green bracts.
J. betonica -Tall flower spikes of light green with lilac flowers above a small shrub-like plant. Short lived.
J. brandegeana (syn. Beloperone guttata, Drejella guttata) (Shrimp plant) -Small shrub with highly attractive coloured drooping bracts (yellow or bronze) and small tubular flowers.
J. carnea (syn. Jacobinia carnea) (Brazilian Plume) -Evergreen shrub to 2m in the tropics, somewhat deciduous in subtropics. Large terminal flower clusters in pink or white.
Want to Learn More?
Check out publications in the ACS Bookshop: www.acsbookshop.com
For more information on Courses on Horticulture and Plants:
In Australia: http://www.acs.edu.au/Courses/horti.aspx
In the UK: http://www.acsedu.co.uk/Courses/horti.aspx
Tropical Plants Course: http://www.hortcourses.com/courses/tropical-plants-bht234-404.aspx