Mystery Plant in England: Possible Weed or Valuable Specimen?

Mystery Plant in England: Possible Weed or Valuable Specimen?

A gardener in England had a plant that survived winter as a small leafy shrub and grew to 3 feet high and 2 feet wide in 6 months. The wife called it a "triffid" due to multiple side stems. Leaves were broad-based with saw-toothed edges; flower buds were about to open.

Flower 1

All Plant 1

Expert Response

The expert (in New Jersey, USA) couldn't be sure but thought it looked like a weed. Weeds can be invasive and choke out natives. They recommended taking photos to a local garden center or agricultural agent for identification. If it's a problem weed, pull it by the roots; if valuable, enjoy it.