Mix in leaves, compost and wood chips. Add more to the top and let sit for a year. Do not add sand. Sand a clay more times than not turn into a concrete type material that will take even longer to fix. Seriously though on plain old organic matter. I have red clay. The worst type you can...
I have had most species of peppers flower, set fruit and grow them to maturity in temps below 50f. I think there are many other environmental factors that are far more important than night time temps when it comes to fruiting. Most of the time our plants suffer from Attentionitis. In other...