Healall: Prunella vulgaris
||Weed Description: A perennial
from stolons with square stems and light blue to purple flowers. Healall is
primarily a weed of turfgrass and lawns, but is also found along roadsides or occasionally
in pastures and hay fields. Healall is found throughout the United States.
|Seedlings: Cotyledons are
spatula-shaped and occur on hypocotyls (stems below the cotyledons). Cotyledon
apexes are notched. First true leaves as well as all subsequent leaves have
'crinkled' leaf surfaces.
fibrous roots, and stems that root at the nodes.
Fruit: A brown nutlet containing 1 seed each.
Four nutlets occur per flower.
||Leaves: Arranged oppositely along the
stem, oval-shaped in outline. Leaves are approximately 3/4 to 3 1/2 inches in length
and 1/4 to 1 1/2 inches wide. Lower leaves occur on petioles while upper leaves may
not. Leaves are usually without hairs or only slightly hairy. All leaves have
'crinkled' upper surfaces.
Branched, usually growing prostrate along the ground and relatively tolerant of mowing,
but can grow erect and reach as much as 2 feet in height. Stems are distinctly
square and hairy when young but usually without hairs on older plants. Stems can
root at the nodes.
|Flowers: Occur in spikes at the
ends of erect stems. Many 2-lipped flowers occur in clusters in these spikes at the
ends of the erect stems. Individual flowers are are tube-shaped and light blue to
purple in color.
The 'crinkled' leaf surfaces, square stems, stolons, stems that root at the nodes, and
cluster of tube-shaped flowers are all characteristics that help in the identification of
healall. Healall is sometimes confused with Henbit
(Lamium amplexicaule) and Purple Deadnettle
(Lamium purpureum), however both of these weeds have leaves with rounded teeth
along the margins unlike those of healall. Florida
Betony (Stachys floridana) also has a similar leaf shape and growth habit,
however this weed has scalloped leaf margins and large, white underground tubers unlike