Each piece of a GreenStalk Vertical Planter is sold separately so you can mix and match depending on what works for you.
These are great for add-ons, but if you don't already have a GreenStalk Vertical Planter, it's more cost efficient to order a new GreenStalk than it is to create one from individual pieces.
WHAT COMES IN THE BOX
Single Grey Watering Disk, Instructions
For reference, a full GreenStalk Vertical Planter comes with:
3 Tier GreenStalk - 3 planters, 2 grey watering disks, 1 top water reservoir
4 Tier GreenStalk - 4 planters, 3 grey watering disks, 1 top water reservoir
5 Tier GreenStalk - 5 planters, 4 grey watering disks, 1 top water reservoir