With many weeds; in a manner characterized by an abundance of weeds.

With reference to a plant: in a manner resembling or reminiscent of a weed, especially in growing quickly or profusely.

So as to be thin, weak, or feeble; especially (with reference to a person) so as to be lanky or weak-looking; with a lack of physical vigour or strength of character; in a contemptibly feeble manner.