Crocus Flower Invasive. Crocosmiiflora hybrids which are invasive in the UK Republic of Ireland New Zealand the American Pacific Northwest and probably elsewhere. This will give the bulbs the time they need to store energy for next years flowers.
Cyclamen - tubers Cyperus alternifolius Umbrella plant - all parts. Yellow iris is a perennial herbaceous aquatic plant whose leaves and flowers grow above the water surface. Crocosmias are grown worldwide and more than 400 cultivars have been produced.
Vernus seem to have a harder time in lawns though see the advice below from the Missouri Botanical Garden.
Wetland Indicator Status. Leaves are broad flat sword-shaped stalkless and have parallel veins. A gift from Russia. Crocosmia are winter-hardy in temperate regions.