There are several methods you can use to support your plants... You can build a lattice, stake and tie etc. I am going to show a cheap/possibly free way to make a loop and stake support. This works well for tall plants with a stalkier base (in my case, Italian Basil).
In this picture you can see the problem with my Lemon Basil. Note that I was too quick to install my support so you can't see how my other plant (in back right) was folding over itself :/
Second picture: Two weeks of growth
Thrid Picture: Right after planting
Coming Soon: Drain/Fill Level Tube ||| Dealing with Reservoir Light Leakage ||| Perpetual Harvesting (for fruiting plants)
Step 1: Materials and Starting
1. An old metal hanger (like one from a dry cleaner) or some rigid wire (that can be bent/formed).
2. Pliers capable of cutting wire.
To start off - straighten your hanger and cut off one end (the hook or other twisty end).
Step 2: Forming the Loop
Next bend two hooks on either end of your loop. The idea is to make a clasp of sorts. We'll open the clasp and put the loop around the base of the plant like a bracelet and then close it before staking it down.
Cut off excess wire.
Step 3: Now Make Three Legs
Put each loop onto your ring and then crimp it down to make a tighter fit. If you feel you need to - hot glue (or solder) in place.
Make each leg about the same height.
Step 4: Install!
I pushed my legs through the top hole of my mesh pots - thus wedging it between the pot and the plastic lid (remember that it's a tight press fit).
Step 5: Training
To do this I had to do some re-arranging. Moving your plants (once established) is not recommended. But if it needs to be done, do so with care.
My lemon basil has really taken and is loving its new home. I've already cut two full stems off for cooking (chicken and lemon basil with a little butter -- the whole place smelled like lemons :P). Expecting it to grow as fast as a weed, I am having it take to my patio rails. This means my garden is now permanent -- moving it will damage the plant.
Looking at picture two, you can see how the root system has really taken off. Out of curiosity, I checked it three days ago and measured -- 14 inches. Today (three days later) it was only slightly larger -- but the plant mass has grown quite a bit (not measured). This is expected and exactly what we want.
The third picture shows the slight gap between the water level and the mesh pots. As two of my plants have established root systems like this, it is important to give a little gap for aeration. I don't want to put more of a gap just yes as not all of the plants have established themselves.
Last picture -- Just under two weeks later. 1 plant (rosemary) did not make it. But it was very small/weak to begin with.