Bill - experiences with HABITAT on terrestrial plants (and several aquatic species) indicates that we don't have to wait until plant-maturity for excellent treatment results (as with glyphosate on perennials). Cattails are an example. Actually, both annuals and perennials often respond best during their initial growth-phases. In some cases, a reduced-rate of imazapyr and glyphosate (tank-mixed) works extremely well on a broad spectrum of species - even several woody plants.
But, as previously warned, avoid using HABITAT away from the shoreline (on the ground) where the roots of desirable trees may exist. The roots may pick up the product through the soil, with unpredictable impact on the tree (depends on the specie). KD
