Mid April should be ok if it’s not too cold, then again at end of September. It needs to be done twice a year to be effective. You might find if you look on line they will tell you when to apply, sometimes they don’t sell them until the time’s ready.
Gardening on the wild, windy west side of Dartmoor.
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wild edgesThe north west of south east WalesPosts: 8,848
I'm still on the fence about nematodes, too much misleading information provided about their safety to other creatures. If I had a valuable plant in a pot that couldn't be disturbed I might try it but otherwise I'm sticking to manual removal for now.
Sue 33
Posts: 1
Posts
I think ideally you would apply nematodes in late Summer / early Autumn.
There's information here
https://www.rhs.org.uk/advice/profile?pid=234
and l think @wild edges is a bit of an expert....
You might find if you look on line they will tell you when to apply, sometimes they don’t sell them until the time’s ready.