Zucchinis/Courgettes give a generous crop yield when growing on aeroponic towers.
Although you probably have been advised to grow zucchinis using only the 3 lowest sections of the tower, at Agrotonomy, as a planting strategy, we prefer to use the whole tower (with the support of a grow cage).
Seedlings planted in the lowest section of the tower will grow roots which will restlessly reach inside the bottom reservoir containing the diluted nutrient solution. It is therefore important to do ongoing root maintenance since your tower is an aeroponic system and not a Deep Water Culture system.
Like with cabbages, if you let your zucchini plants grow roots into the bottom reservoir, you will end up with beautiful looking vegetables but they will feature a weak nutrient density in comparison to the plants grown truly aeroponically on the upper sections. Contrary to a DWC system, when the roots are submerged in the nutrient solution of your tower, they do not receive enough oxygen to deliver optimum results.
Do not hesitate to trim leaves to permit access to the inside of the reservoir for root maintenance.
Although zucchinis are easy to grow, the crop yield can be easily affected by fungal diseases (powdery mildew, bacterial wilt, downy mildew, yellow mosaic virus and botrytis blight) and by pests & insects (cutworms, cucumber beetles, squash bugs, vine borers, spider mites, aphids, and whiteflies). This is why it is crucial to monitor your plants closely and to take actions accordingly in the early stage of development of each potential problem. In humid climates, it is recommended to lightly spray the foliage with an organic anti-fungal formula every other week for mildew prevention.