edit: lady bugs being released to do murder. alt text doesnt seem to have loaded correctly when posted.
at least half will just fly off. i do 3000 when the milkweed is about a foot tall. and the aphid population has become managble the past couple years. since i moved in 4 of the closest 6 houses have changed hands and all those new neighbors are gardeners. so if the bugs fly off and eat the aphids next door i'm ok with it.