I recently acquired three Concord Grape plants. I have plans for them to permanently reside at the base of a pergola that is not yet built. Although it should be built within the next two years, the area is in no way prepared to accommodate the grapes permanently. I know this is not an ideal solution but I have three very large pots that I decided to plant the grapes in to at least get them growing. I have never grown grapes so I need some advice on what trellis configuration would be the best given the circumstances. I don't mind using something that can later be attached to the legs of the pergola, but I am not sure what would be the best solution.

Thanks for any help you can offer!