unwanted bulbs

Johannes Ulrich Urban via pbs pbs@lists.pacificbulbsociety.net
Tue, 21 Apr 2020 14:27:02 PDT
Dear All,

For unwanted bulbs (im my case Oxalis pes-caprae) the best results have 
been in covering the soil with material that excludes light. One growth 
cycle without light is enough to kill those bulbs which make a new one 
every season but it may need more than one season for those which have 
permanent bulbs. I would think that black plastic is easy to manage 
under Rhododendrons, there is a woven black plastic tissue which lets 
water and air through but not light. Nurseries use that a lot to stand 
their pots on. Much much easier than digging and does not harm the roots.

Bye for today


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