After growing for four months, the previous crop of lettuce and arugula bolted. I pulled 25 plants out and cleaned the unit thoroughly today, then transferred new seedlings into the tower.
Seeds were planted into rock wool plugs a couple of weeks ago, set in a glass pan by the window. They sprouted within a few days. I planted kale, Mesclun mix lettuce, Paris Cos lettuce, Aunt Mae's bib lettuce, arugula and spinach.
The two larger plants in the unit are a kale and bell pepper, saved from the previous batch of plants started in Nov., 2020. I'm wondering how they will do as I disturbed the roots quite a bit, first in pulling them out, then stuffing them back through the small hole.
I will also set three older potted plants inside, on the water tub. They'll stay in until it gets warm enough outside, which here by Lake Michigan could be mid-June. Bell pepper, parsley and arugula. As an experiment, last fall I grew one pepper plant aeroponically and the other in dirt. Their growth was similar, although the one in dirt grew larger. I'll put it outside if it lasts until June. Both bell pepper plants produced four small green peppers.
The Aerospring unit has held up nicely, considering it's been in contact use since Nov., 2019. After washing the tower sections in the dishwasher, scrubbing out the mesh cups with a toothbrush, and washing out the tub, the unit looks as good as new. So far, it has been a quality product with great support from Nadine in Singapore. It has yielded enough for two people to have a large plate of lettuce every day for four months, and then some!