Dandelion is considered one of the dynamic weeds
since it likes a good deep soil as do clover and alfalfa. Soil
around dandelions is liked by earthworms, for this plant is a
natural humus-producer. Dandelions on your lawn may frustrate,
but actually they are not in competition with the grasses
because of their three-foot deep roots. They bring up
minerals, especially calcium, from beneath the hardpan which
they penetrate, depositing them nearer the surface thus
restoring what the soil has lost by washing. When dandelions
die their root channels act like an elevator shaft for
earthworms, permitting them to penetrate deeper into the soil
than they might otherwise.
ethylene gas which limits both the height and growth of
neighboring plants. It also causes nearby flowers and fruits
to mature early.