Tomatoes - Potash

I added some Potash (Potassium) to my tomatoes (10g to a watering can) as it assists fruit development and ripening. I have lots of large unripe tomatoes which are taking their time to ripen. Hopefully this will help. Noticed that this year they have been attacked by caterpillars, whiteflys, mildew (now under control). I will water in some Charlie Carp next weekend. Everything else appears normal, uneven watering was a problem a few weeks ago.