Hanging Tomato Planter Product Review Part 1.5

Even though there haven't been any blooms, I though I would post a quick observation. It seems the plants are growing very well but I have noticed a darkening where the stem comes out of the planter. As the planters are watered fro the top and the opening is a sponge with a slit cut to the cetner, I am afraid it may be rotting at the base. More to come...