Euphorbia 'Helen Robinson'

This splendid euphorbia is a cross of Euphorbia robbiae x Euphorbia characias that occurred at Hyde Hall Garden in the UK, and was later named for its late owner. We have been very impressed by its garden performance, which resembles a Euphorbia robbiae on steroids. The 30" tall, deer-resistant Euphorbia robbiae-like rosettes which spread by underground runners, are topped starting in mid-April, with 4' tall flower spikes of chartreuse yellow. In rich soils, the rate of spread may be a problem for wimpy plants growing nearby. Our 3-year-old clumps, growing in amended sandy loam, have made an 8' wide patch. Dry soils and root competition slow it down to a crawl.