We have a sycamore nearby and each year we have to keep an eye out for
numerous seedlings which establish themselves with remarkable speed.

We also have several Clematis montanas around our garden which each year
coat the garden with their seed heads. All I do with these is let the
flymo vacuum them up from the grass and otherwise leave them where they
fall. I never see clematis seedlings.

Why the difference?

d
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dave or stella @ stejonda