Are Daylilies Invasive?
This summer we've been mapping Orange Day Lilies (Hemerocallis fulva) along eastern Ontario roads to see what kinds of places they're growing in. This was inspired by the good season this species has had, the thought that we had neglected them in comparison to other alien roadside plants, and comparing them to Lupines (Lupinus cf polyphyllus) in New Brunswick, which are a wildly popular invasive species which spreads along roadsides from plantings at homesites. With the spraying that municipalities are doing against 'poison parsnip,' killing off all the broad-leaved Dicot herbs, there's the real possibility that Day Lilies will be favoured and become even more widespread along roadsides. We saw the first bloom on 19 June, and were are still a few coming out on 10 August. Wikipedia says: "Triploid... Hemerocallis fulva var. fulva ... native to Asia from the Caucasus east through the Himalaya to China, Japan, and Korea... has escaped from cultivation acro