Actually, I should have been more clear, I never replace the old plants, just add a new plant every 2 weeks, and I do 5 plants per box. I also start a new "late cuke" box or two right about now, as I just pulled the last of my radishes from an EarthBox, and by this weekend my spinach box will be retired.
Good idea on the topic...I think I will start a new topic Gardening Tip of the Day and move John's and the following posts.
Can this work with tomatoes too? I have two tom plants to be transplanted into a EB. One is about a foot tall, the other is 3"-4". If I plant them both, will the larger one steal the nutrients from the younger? Or will it work much like the succession planting with cucumbers?