Isatis is a genus of plants that are grown as hardy bulbs in the garden.
Isatis blooms in the summer with small yellow panicles and may reach a height of 30 to 90 cm (1 to 3 feet) in height.
Some of the common names for Isatis are Woad and Dyer's woad.
It has been traditionally used to produce dye and paint.
Isatis tinctoria - Dyer's Woad by Matt Lavin.
Woad by peganum.
Common Names: Woad, Dyer’s Woad, Asp of Jerusalem, Glastum.
Life Cycle: Hardy biennial.
Height: 12 to 36 inches (30 to 90 cm).
Native: Mediterranean, Western and Central Asia.
Growing Region: Zones 3 to 10.
Woad should be grown outdoors from seeds. The Woad seeds should be sown out in the latter part of summer and lightly covered.
It can take from two to seven weeks for woad to germinate.
They should be planted in a sunny or partially shaded part of the garden into a rich, moist soil that has good drainage. Once the seedlings have emerged thin them out so that they are about 20 to 30 cm (8 to 12 inches) apart.