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Giant Yellow Flower Spike

Observed: 5th July 2012 By: menhir
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Description:

This appeared at bottom of my garden in rough grass at the base of a 25ft high privet hedge.
It's over 2m tall with a 2-3cm thick stem and 30-40cm leaves.
At the top is a stunning 40cm sulphur yellow flower spike.
What is it? Would it be wise to collect seed and grow it as an alternative to hollyhocks or sunflowers?

Identifications
Species interactions

No interactions present.

Species with which Mullein (Verbascum) interacts