Linaria dalmatica & L. genistifolia
Dalmatian toadflax is a creeping-root perennial that spreads by seeds and underground rhizomes. They have snapdragon-like flowers that are darker yellow at the upper leaf and lighter yellow towards the spur. They have blue-green colored clasping leaves that are very waxy and alternate up the stem.
A single Dalmatian toadflax plant has the capability of producing over 500,000 seeds per plant. These seeds have the ability to remain dormant in the soil for around 10 years. With its extremely high seed production and extensive root system, this plant has shown the ability to increase 1200% over six years on sites in Colorado (Beck, K.G. CSU).
In Teton County we have seen very aggressive infestations of Dalmatian toadflax invading disturbed rocky soils, as well as establishing monocultures on south-facing slopes. This is a very challenging weed to control.
For help managing infestations
please call Teton County Weed & Pest District 733-8419