Kit includes:-
A 11ltr square pot sitting on a 3.3ltr reservoir giving a very large backup water supply, even big enough for a short holiday. Comes with 3 rings & rises, purchase more if desired see below. Just place the first vertical ie riser, in the pot and then fill with your potting mix, as the plant grows add extra rings and rises. Extra risers and rings can also be used to support a plastic bag cover to create a mini greenhouse, or some netting to keep birds or possums away.

The tomato tower pot is a square pot 280 mm wide and 280 mm tall, UV stabilised plastic okay for outdoor use, they come with three extension sets which takes the growing height from the surface of the soil to approximately 750 mm you can add extra rings and rises each one adding an extra 300 mm, however if you add extra rises then you may need to secure the base of the pot so it doesn't tip over, rather than letting your blueberries grow 2 m tall you might be better to train them up and down, or just let them get to the top circle and then let them fall down like a cascading effect, then if they get to the bottom you can start training them to go up again.