We are planting native oak woodland understory in a few places around the Reserve. One of these areas is currently 99% Nasturtium (Tropaeolum majus). Cal-IPC evaluated this plant but did not list it. It certainly seems to be gaining ground in one of our drainage areas and I consider it invasive. It came from a neighboring property and crept under the fence. This annual isn't hard to remove and I doubt it will be a serious competitor with our natives, once established.
Wood mint (Stachys bullata) was planted in tight clusters so that it might gain some defensible space against the Nasturtium. About 30-35 plants per cluster, 6-12" apart. Next year I'll get a bit more diversity in and plant blackberry, coffeeberry, and others.
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