Grape Hyacinths
Ally5
Posts: 13
We are helping a neighbour with her garden and it is totally over run by grape hyacinths, back and front. We spent weeks last summer digging most of the bulbs out by hand with a trowel and any little roots we could find and now they are almost as bad as this time last year. Is it possible to use Resolva or similar on them? She tried in 2012 and it made no difference.
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Hi Ally, yes, but she should use a glyphosate-based weedkiller then leave them alone (ie do not remove any leaves, even when they go yellow.) As the leaves die back, the glyphosate will be taken into the bulb and kill it. She may have to repeat this for a few years as previously shed seed will still germinate and new bulbs will form. Resolva is good stuff but it does kill the top growth off very fast, probably too quickly for much of it to be taken down into the bulb.
Yep.. ^^
the only instant solution would be to remove each bulb at a time
Me too, Verd! I planted one of those muscari 'star' kits where you lay a paper star-shaped guide out on the ground and plant lots of bulbs at marked positions. They still appear in that area even though I put down a sheet of weed membrane and built a raised bed on top of them 10 years ago!