Purple weed could save California’s pot farms from ‘severe’ pathogen. ... They rubbed the viroid directly onto cut leaves of the plant, an established method for infecting plants with diseases.

This weed has long petioles (the stalk that attaches the leaf to the stem) on lower leaves and, in contrast to henbit, short petioles on upper leaves. The top leaves of purple deadnettle are ...

Purple deadnettle pops up quickly in spring then goes away just as fast in late spring. ... While they are weeds and can form large populations of plants, deadnettle really doesn't do much harm.

The difference is, “Henbit leaves are attached directly to the stem, while Purple Deadnettle leaves are bore on small stems called petioles,” according to Burbrink.

Common names: Purple alternanthera, purple joyweed, ruby leaf alternanthera. The genus Alternanthera has approximately 200 species worldwide native to southern Mexico, Central America, the ...