Need to know more about what you're doing at home & at community garden.

Soil preparation? Amendments? Mulch?
Watering?
Fertilizer? (Fert, alone, doesn't substitute for lack of the above.)

I would add as well, what is the difference in sunlight between the two locations?

I built raised beds at home then went to a center that sells top soil by the bucket load (you dig it and take it away) and also compost, mixed the above in the beds. This was sucessful for all kinds of veg such as onions brocolli (mammoth crop) carrots beans etc etc everything except pepprs. The community garden was a couple years ago in another town maybe I should have soil tested in both locations to see difference. As far as light maybe they get shaded by super tall brocy plants.

Do you fertilize?

I tried a DIY mix I got from MIGardner's channel on you-tube. Tehre were about 5 ingredients but I've never grown such green and husky peppers. For the first time they looked like the ones grown in a green house.

I'd add something to looses the mix up however, maybe more perlite than recommended or peat moss.

Location? Peppers are hard to grow in Antarctica.