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from Pest Effects contains
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Some biocontrol companies sell 'Banker Plants Kits' which are basically
aphid infested plants (usually oats), in which you can build up natural
enemies for later release. The favoured option by many folk now is to
use a safe foliar treatment (such as savona, sb plant invigorator or
Just Bug Killer), when aphids first appear then add beneficials to keep
future ingressions in check.

You sound as if you are posting about American circumstances, is
that right? What pertains or is available in the US often doesn't and
isn't here in the UK. This is, specifically, a UK gardening newsgroup.

Janet.