[Speed of green]

highest yielding autos ive heard of are about 112g, im sure there are higher but i would say this is a great yield for an autoflower. id take photoperiod plants over autos.

[gorilla ganja]

I have seen auto's yield way more than that indoors.
Outdoors it's a lot harder to get the yields, unless proper care can be given to them.

But they do have advantages.
3 weeks you can sex them usually
They are in the 2 -4 ft height range, which are way easier to hide than 8 ft monsters.
No more than 100 days or so from sprout most in the 65-85 day range.

think I read 45 degrees North for you, This gives you a lot more options than at 55 North as far as Photoperiod plants that will finish for you.

So either way will work , just depends on your set up and hrs. available to tend to them.

Best of luck and may all your Buds be Huge

Peace GG

[TychoMonolyth]

Thanks. I've been researching since November and learned a few things. Learning how to grow Autos and Photoperiod plants is like learning how to be a Dairy farmer and a Vegetable farmer at the same time.

I'm tempted to plant 400 Autos in two staggered crops and pass on the photos. The down side in yield is the only thing that's holding me back.

[acdc]

try berry bomb auto good yielder grows big

[rolandomota]

Try some auto malawi x northern lights from ace seeds they are sativa dominant and high yield. Also some freeze and freeze crosses from beanhoarder he says they perform well outdoors in the north thats where he grows guerrilla style in Canada

[lagoutche.]

neville's haze auto would be perfect for you .....4 month life 500 grams by plant ,sativa effect ......

[TychoMonolyth]

Originally Posted by lagoutche.

neville's haze auto would be perfect for you .....4 month life 500 grams by plant ,sativa effect ......

Nice. Thanks.

[soil margin]

I'm always a fan of high plant count outdoors, especially if you're gonna mix it up with a few strains that have different resistances/preferences/etc. You just have so much less risk than doing a run with only a few plants where you lose a big part of your crop from losing one or two plants.

[Spaventa]

At 45n I wouldn't even consider autos. I do but Im at 51n but theres still photoperiods you can finish outdoors here.

400 autos is a lot of coin on seed but even if that doesn't bother you, you don't now what your getting and with 400 seeds you probably will get some seeded, some descent, a lot of shit.
A tested photoperiod clone would be a lot better. Must be someone in your area who could fill some trays with cuts?

as to the original question - it comes down to light penetration - theres no point growing a densely planted canopy taller than 5 feet because the light won't get down to the lower parts. 9ft tall is fine if they have space but if you are planting close, id aim for 5 feet finished height - any higher will be more junk stem and leaf