I grow starts out in 4 1/2 in. pots and wait for a pod or 2 to set before they go out so I get pure seeds from what ones I want.
No fans etc on my grow.
My opinion is that if the plants aren't tangled with each other it takes something to get stray pollen to get past the buds own pollen to cross.
I don't use a brush or? to mess with the buds anymore.
I used to have a different brush for every plant.
Tossed the brush out (or used it otherwise-not on plants)after the plant I used it on set pods.
The more I brushed my buds the more crosses I got in general.
I think pollen was released by my brushing into the air than if I let the buds alone.
My brushes ended up probably getting contaminated just from stray pollen around the grow shelves.
Once I stopped messing with buds I saw a TON of pollen under buds on leaves that I NEVER saw when I was shaking or brushing.
Pollen is microscopic and i think I was spreading it around from tools etc while trying to actually isolate stuff.
Netting is to keep pollinators out but keeps the aphids etc in.
Netting is for bugs,too big a mesh for pollen particles.
Check out the size of a piece of pollen...
Nets work outside BUT often raise the temp. inside it so buds are too warm,won't set.
Just in case some stray pollen is around that wouldn't have pollinated a bud (on a petal that I moved around accidently or whatever or just messing with several plants put stray stuff on my brush,tools or whatever)without my brushing the bud the bud was left to mother nature.
ALL I need are a couple pods per plant.
Once I get a pod growing indoors I mark them and the plant goes outside to the bees and grasshoppers,crickets and mites...
As long as branches aren't touching I think I'm cool.
Ya I had 20 buds and got 2 pods-so what?I got pure seeds in #'s to keep my collection fresh.
I've had more crosses trying to Isolate stuff by hand and never got crosses from plant left alone.
Fans etc. would certainly change the whole thing.ANYTHING you do that messes with the way your plants do what nature wants them to do can mess things up.
I think,in general,a lot of people screw up by trying to HELP their plants in general.
Kill with kindness is the rule rather than the exception these days.
Just read all the nute question posts etc.
Plants are designed by nature to GROW AND SET PODS/Propagate.
Let nature do it's thing,helping isn't all it's cracked up to be.
Self pollinating plants are designed to do just that.
Without bees or humans they carry on.
Messing with pollination in a small grow only makes you the possible bee.
I only grow for a pod or 2 of pure seeds for personal use...
As stated above,commercial seed sales is a totally different ball game.
My opinion is just that,worth exactly what you paid me for it.
I'd go with keeping plants from overlapping branches and let nature do it's thing.
You'll get pure seeds from only a fewer # of pods but have enough to re grow and a few to trade.