Serrano will give you dozens of medium-thin walled fruits per plant. Pick them early when the peppers are green and more mild or wait until they're mature and "red hot", at about 10,000 Scovilles. Days to maturity are from time plants are set in garden. For transplants add 8-10 weeks. Space plants 18-24" apart.
Pepper 'Serrano' 3.5" Pot