Hi, I know this post is 5 years old, however I have got the same problem... not tried glyphosate gel yet but just wanted to see if there were any further thoughts on how to 'remove' old bulbs from under newly laid turf. Don't want to lift and relay as I paid a landscape gardener a lot of money to clear ground and lay turf in the first place!...
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Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.