Warwickshire,
United Kingdom 
when best to cut back? Do I need to dead head?
On plant
Lathyrus vernus
16 May, 2010
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Lathyrus Latifolius 'Pink Pearl'
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Yes, you need to dead-head unless you want seeds. Cut down to ground level in autumn, so says my book!
It also says the foliage dies down after flowering!
16 May, 2010