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Deadhead Verbascum Helen Johnson ?

I have several which have reached the stage of being very tall with only a few flowers on each and a few new shoots which havent really taken off.
 
Some advice says to deadhead them to encourage new flowers. Others to cut the main stem back to encourage new growth of stems.

Does that mean just snip the individual flower heads that have expired on all the stems or the more drastic cutting of the main stem completely and cutting the other stems as the flowers fade ? 

Which is recommended  by those who actually grow the plants.  Thanks 

Posts

  • Pete.8Pete.8 Posts: 11,340
    When the flowers on a spike have just about finished, cut the whole spike off at the leaf-joint below. With a bit of luck you'll get a new flower spike appearing from that leaf joint.
    Do keep an eye out for verbascum caterpillars - they demolished one of mine last year before I caught them, there were 20 or more on a single plant -


    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
  • LynLyn Posts: 23,190
    I grow them just for those caterpillars.
    Gardening on the wild, windy west side of Dartmoor. 

  • AnniDAnniD Posts: 12,585
    At least they make no attempt to disguise themselves! 
  • FireFire Posts: 19,096
    Astonishing colouring
  • Pete.8Pete.8 Posts: 11,340
    There were beautiful and probably 50+ of them.
    I didn't notice them until the plant was almost stripped bare  - and it was right at the front of the border.
    I cut off the remains of the spikes and put them in the compost bin with the caterpillars - some distance from the plant.
    An hour later I noticed the fence behind the compost bin had all the caterpillars crawling up it making their break for it - I'm hoping the birds made the most of them

    Billericay - Essex

    Knowledge is knowing that a tomato is a fruit.
    Wisdom is not putting it in a fruit salad.
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