to the whole neighborhood than a strictly native approach, plus it is faster and less costly to fill in gaps with divisions of ones own or ones neighbors’ familiar perennials. But avoid “thugs,” the most invasive alien plants, such as Scotch broom (Cytisus scoparius), purple loosestrife (Lythrum salicaria), and English ivy (Hedera helix), whose seeds or berries can easily be spread downstream and elsewhere, squeezing out native vegetation. If you find any natives in your ditch, leave them; they
