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What I've found helpful is to buy a load of cheap black pcv pipe from a diy shop. Then cut it into ft lengths, wrap with some bare copper wire and plant into that.
The roots will go down to the ground and the sunflower will quickly grow out of the tube.
This should stop the slugs climbing the stem and eating the leaves.
Resuable each year. If the copper gets too tarnished you can clean it.
hugo7
JWestland
The slugs ate all my sunflowers (sigh) will try in pots off the floor next year.