Lovania Nurseries general manager Charmay Ball said: "Some things were ready early and we've been waiting for things to be ready that would normally be. We have had a few problems."
Rijnveld's Early Sensation daffodils flowered two months early at the Eden Project in Cornwall. Horticulture chair Don Murray said: "The quite bizarre warm temperatures this November are more akin to spring."
Also in Cornwall, the Lost Gardens of Heligan saw six rare giant tree dahlias (Dahlia imperialis) blooming this week. They rarely flower in the UK due to the shorter growing season.
Plantlife landscape conservation manager Andy Byfield said snowdrops were two months early. "My suspicion is that the cultivated plants that have been triggered into doing their stuff more than wild flowers. It could be day length or a cold snap but something triggered them."