Plugs can be stored for 1 week in the dark (1 week in light) at 45F and subsequently grown into very acceptable plants and/or flowers. Treatment with a growth retardant (paclobutrazol or uniconazol) is recommended to prevent stem lodging (falling over) after transplanting outdoors. These chemicals did not otherwise influence flower and cluster number or size.
Verbena: ancient Latin name for the common European vervain, V. officinalis.
Some favorite cultivars and their flower color are ‘Pink Shades’, ‘Blue with Eye’ (blue bicolor), ‘Mauve Shades’ (rose bicolor), ‘Heirloom Blue’, ‘Heirloom Mango’, Babylon Neon Rose’ and ‘Babylon Lilac’.
Common name Vervain is supposed to be derived from the Celtic words “fer” (to remove) and “faen” (stone), referring to its use in treating bladder stones.
Will generally do well in light levels at least bright enough to read a newspaper in comfort but more light would be better.
The American Academy of Allergy, Asthma and Immunology lists this species as an allergy-safe pollen producing plant.