Tart fruit that will sweeten if picked after a frost

Described as firm and crisp

Size: Bush 6-7ft

Fruit: Yellow with a red overlay

Hardiness: Zone 2

Comfrey Grape Tart fruit that will sweetenThese are growing up all over my property. They can make a great companion plant, nitrogen fixer and compost accelerator. They grow up extremely fast and the leaves can be harvested a few times each year. While they don't spread and multiply on there own like other invasive plants, they are pretty much impossible to get rid of once established, so I want to offer a disclaimer. Any small fragment of the root that is not eliminated will continue to grow