Last year the hot peppers did o.k. I even now have a couple of jalapeno's that have lived over, but they are a local cultivar, the mainland ones do not live past a year. I do grow a bunch of nectar plants for pollinators and beneficial insects and I rarely use insecticides unless, I have no other alternative.
I keep most of my hot peppers in 1-3 gallon pots for the first couple of years and then pot them up. I just lost an 8 year old super chili to peach scale. Peach scale is resistant to pesticides so I use soap and a brush to scrub them off. The plant just got worse over three years, so it was time for it to go. It actually started as a seedling (from the birds) in my eggplant pot, so that was the only one in a 20 inch pot.
I do have hot spots for nematodes and I do plant crackerjack marigolds, sun hemp and mustard to kill them. In one of the spots, that I had nematodes, I also had a lot of nut sedge, so I dug all of the soil out a couple of feet down and put in all new soil. Most of my plants in the ground do have to be nematode resistant, so that keeps the nematode counts down.
The real pain, is that I have to work those areas last and when I am done I have to clean my tools, and boots with bleach.
My bell peppers never live long enough to outgrow the 1 gallon pot, but I might try a few in bigger pots to start with and see if that helps. I don't usually lime anything anymore, but I will try giving the peppers some dolomite and see if that improves it as well. I get dolomite from my orchid club and I may have a bottle of it lying around somewhere. I gave a bag of it away a few months ago.
Thanks this gives me a couple of things I can try to do to get more production.
I have been having problems with some of the other plants too. Last year, I only got a few tomatoes, 4 zucchini from two plants that just could not get the flowering to sync., and this year my cucumber is petering out after one cucumber. I thought it was probably due to the weather moving the seasons later. The cold weather persisted until June and it rained later than usual. This year it is again staying cold longer and although because of the storms that came by earlier this year, we got the usual inches of rain, it has been drier than usual the rest of the time. I have very crunchy and dying grass now, because there hasn't been enough rain and I have my sprinklers turned off at this time of the year.
Happy gardening in Hawaii. Gardens are where people grow.