Contact-type herbicides such as this only “burn off” foliage and do not kill the whole plant. The loss of leaves forces weeds to regrow foliage, using energy stored in the roots and bulbs.

The “red” in the tree’s name is because of the bright red, cup-shaped blooms with five petals that appear in the spring before the new foliage. Viewed at a distance, a tree covered in these red blooms ...