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If there is plenty of food they will hangout in your garden after a release, with plenty of food sources they might even get comfortable and lay eggs. Outside it’s good to add companion plants to attract them.
They absolutely will. They'll breed like rabbits, too, if they've been eating well. You might need to introduce a new colony if there's a lot of time between grows. But even then they just fan out over the area. Increasing their population is never a bad idea.


I often see a few natural ladybugs, even seen some larva, but never a shitload...might have to buy a bunch and try mid summer.
 
The lady bugs show up here in droves every spring...I've never had issues with any of their prey....if only they would eat the catterpillers
i was wondering if they would be a good addition outdoors....would they stay if there was enough feed? Some years certain plants have enough to warrant trying them if they might work well enough
 
I often see a few natural ladybugs, even seen some larva, but never a shitload...might have to buy a bunch and try mid summer.
No matter what you do, they will scatter. Though the attractant plants will help keep them around. I have only limited experience using them outside of a greenhouse. Hard to tell if they made any difference, or if I was just lucky and no pests showed up. This was for my old vegetable patch, but I imagine it would be equally as effective with canna.
 
I often see a few natural ladybugs, even seen some larva, but never a shitload...might have to buy a bunch and try mid summer.
Praying Mantis are also nice to have around, though I don't know if you can order a can of 'em. They'll just wander off anyway.
 
Yeah, almost counter-intuitive is the benefit to planting things that will attract the pests the ladybugs want to eat. Most of which you would otherwise want nowhere near your grow.
I plant nasturtiums in my greenhouse, it’s aphids favorite food. Give them that to attack and the leave the rest alone.

Ladybugs like cilantro, dill, fennel, and caraway. Never hurts to plant these in your garden.
 
Praying Mantis are also nice to have around, though I don't know if you can order a can of 'em. They'll just wander off anyway.
You order egg sacks. 50-200 praying mantis will hatch in 2-3 weeks.
 
Thats the creepy bit about having a bunch of carnivorous insects about. They do a good job of eating bugs that would otherwise attack your plants, but there is something just off-putting about knowingly increasing the population of a species, in an area where you regularly work, that would (if they though it possible) attempt to kill and eat YOU.

Power in numbers, as it were.
 
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