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Oh well. Do the brochures have any advice? Might as well have a look for yourself, here is a vacated pupa from under a hazel leaf. Larvae are quite easy to spot once you have your eye in, they’re pretty fast moving, tiny black/orange aphid death machines. Don’t let the pupae get too hot of course, expect ladybirds in max 2 weeks. Unlike larvae they have wings, so adults perhaps not as likely to remain where you want them…
I’m interested to know more about the vendor, do they sell them in bulk for farmers etc, or is it more for the windowsill market?
Have a look for ladybird larvae outside, a couple of those will sort the aphids out in no time.