How to prune allium 'gladiator'

After flowering in late spring to early summer; foliage removal in mid summer once fully yellow. Cut spent flower stems cleanly to soil level. Resist tidying foliage early even if it looks untidy — it is photosynthesising reserves back into the bulb.

Once annually after flowering. Allium 'Gladiator' is a low-maintenance bulb. Deadhead faded globes to prevent excessive self-seeding, or leave them as structural seedheads. The foliage often begins yellowing before or during flowering — this is normal. Allow it to die back fully before removing; cutting it early starves the bulb for the following year.

Cut spent flower stems cleanly to soil level. Resist tidying foliage early even if it looks untidy — it is photosynthesising reserves back into the bulb.