hello my fellow gardening geeks, I've really gotten into gardening this year as my other half made me some large planters out of our old Decking, So I toddled off and bought loads of plants to fill one of them and in the other I am growing cucumbers for the first time to. With Dwarf Dahlia to the front. The cucumbers are doing great. No greenhouse grown from seeds in propagator then planted in when about 10 inches tall. Have fruits on them now between 4-6 inches long.
Anyways. My question is. How do I know when the Dahlias are finished for the season, and how do I go about storing them for next years planting out?
Thank you.

Ps. I just want to say, the pic is for the dwarf Dahlias not the wilted cucs, lol. I did query why they were withering but found out that I needed to basically drown them with water. And I can't find the better pic