Short answer: No ;-)

A 12-inch pot will support a single plant, and even then it'll be a real tight fit.
The Thai Hot is the only one of the three that I'd consider keeping in a container that size....

Your final mix (Gritty) sounds like a great plan. I use a similar mix (sans coconut and sphagnum)
and I have very good results.

I wouldn't leave the plants too long in the small pot.

Josh

Thanks Josh
The mix I am using is the same I used with my Alocasia that we discussed in your thread (I added the coconut during my recent repot). The Alocasia survived the winter continuing to grow leaves and after another repot, root prune, it is reestablished and growing yet more leaves! It just refuses to go dormant as everyone says will happen!

Back to peppers: yikes I may not have room for 3 large pots! So even if I got one very large pot, I still should not be mixing the 3 plants in the same pot? I am going to have to do some rearranging with my window sill after the summer it seems!

Hey! That's great to hear about the Alocasia! I do remember now.

Would you have room for 3-gallon containers? Depending upon how many peppers you use,
a medium-sized container might provide more than enough for a good harvest.

Josh

...wanted to add that mixing species is no problem *if* you have the room.
Large, fast-growing plants will hog all the room and light if planted too closely.

Obviously, if you're collecting seed, you'd want to isolate plants as much as possible.

Josh

Yeah, it's not the sharing, it's the size of pot.

The cayenne will get tall, the habanero more bushy (never grown the thai). If you arrange them correctly in relation to the Sun, you could almost do a short up front, tall in back type of thing. But, you need a big enough pot to do that if you expect them to be healthy / produce a decent amount.

Oneleaf,

In your reply you say "I am going to have to do some rearranging with my window sill after the summer it seems!" From this, I take it you plan to overwinter the plants. You can find information on Garden Web about overwintering chiles. If you have room, I'd suggest you have the plants in separate pots through the summer, then cut them back and replant them in a single pot to overwinter them (following the info on overwintering).

Thanks for the responses! Yea I planned to overwinter but i do not mind getting new plants every year either. I did move them over to a large rectangular container that I had lying around and put them in a gritty mix. This is a very large container so it may work.

Any idea on the best fertilizer to use for a gritty mix (bark, coconut husk, granite grit, and diatomaceous earth)? I have an organic Mater Magic for the tomatoes but not sure if organic fertilizers work well in a gritty mix?