I had two very large pots wiht strawberries in, yum yum, but then after a year they looked miserable. Some months earlier I'd seen a beautiful weevil, which of course was a vine weevil. So I pulled out the strawbs, they had almost no roots, and sifted the soil. I found ~100 grubs, which the robin devoured. It followed me around afterwards for a few days. It was my best friend. Anyway, the pot was next to a heuchera and some strawberries in beds, and they have not been touched. Basically a pot is full of soft compost, which is a lovely warm home for weevil grubs which can burrow easily. My clay soil is hard, and uninviting. So they stay away. Or at least do not occur in large enough numbers to cause noticeable damage. It could be that a few hardy ones will persist.
You could take garden soil, and put it into the pots. It will not only keep grubs away, at least I hope so, but require less watering.
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I had two very large pots wiht strawberries in, yum yum, but then after a year they looked miserable. Some months earlier I'd seen a beautiful weevil, which of course was a vine weevil. So I pulled out the strawbs, they had almost no roots, and sifted the soil. I found ~100 grubs, which the robin devoured. It followed me around afterwards for a few days. It was my best friend. Anyway, the pot was next to a heuchera and some strawberries in beds, and they have not been touched. Basically a pot is full of soft compost, which is a lovely warm home for weevil grubs which can burrow easily. My clay soil is hard, and uninviting. So they stay away. Or at least do not occur in large enough numbers to cause noticeable damage. It could be that a few hardy ones will persist.
You could take garden soil, and put it into the pots. It will not only keep grubs away, at least I hope so, but require less watering.
Thank you for your comments, Leifuk, and Sybille I have tried your method before and missed some grubs so don't really trust it but thanks anyway