One of the main challenges for me this season has been tomato flowers slow to pollinate. This was partly because of a lack of flying insects in the early summer. Also, when you have sunny days, you also have cooler nights in the early summer, and a wide fluctuation between day and night temperatures, which can cause a delay in flowers setting fruit.
The other problem I had was fruit splitting on my outdoor plants. Black Cherry and Sungold were badly affected with just one downpour of rain!
I will change these varieties next season to Chocolate Cherry and Golden Cherry F1 which are supposed to be less prone to splitting or cracking. Another two varieties to add to my list!