Sorry, but I do not know the term selsa barrel. Could you describe it? Do you possibly mean salsa barrel?

sorry should have used spell check!

I'm just guessing, but I'd say a tomato plant, hot pepper(s), bell peppers, cilantro. If you like, maybe a tomatillo. All that will take a big container - maybe 10 gallon or more. Again, this is just a guess, tho. I use 5 gal pots for a single tomato.

Add some spring onions?

Could some one tell me what kind of container is being discussed? Salsa?--a barrel that large quantities of salsa comes in? Seltzer, maybe?--Are we talking about a cannister for compressed gases? If so, I'd be interested in hearing how you might have openned the top up for planting.

Ok Nancy, I am really curious now :) What is a salsa barrel? The idea of salsa items being planted together sounds fun, but I am not sure that is what your looking for.
Happy Gardening
Nana