Still Working on the Garden

As you can see, I got that spa back to my house. I was also given 7 more tires for the wall.
Unfortunately, I didn't get the pump for the spa, but did get the heater unit. I don't know what I'm going to do with the heater, but the spa is getting turned into a raised garden area.
It's big enough for a fruit tree, so I may do that. It has eye bolts on the base for moving the spa and these may prove useful if I ever have to net or put plastic over the tree. That will still give me room for flowers or food crops around the base of the tree.
Now I just need to set it down and make sure the drain hole is unplugged so that excess water doesn't accumulate.

I also got some dirt into the bottom row of tires. They are mostly truck tires--16's and 30's.
After I put the dirt in I ran a hose out and started compacting the dirt and filling the voids in the tires.
The soil out here has a lot of powdery clay. It's going to make quite a formidable wall.
 On the left, I have the hose trickling water into the tires. I'm using rebar and and a hoe to move the slurry of mud into the voids. I don't know if you can tell but the voids use about half the dirt, so I'm going to be bringing more in on a continuous basis.

It's been hot today, so I was out with the large straw hat, and gloves because the rebar gets hot in the sun.
 I'm hoping the amount of clay in the soil will make for a good semi-finished surface at the form boards.

As you can see, I still have more tires. That is probably not enough to complete the wall, but it will be enough to get the wall of tires done a few feet out from the block wall in the background.
I did notice a low flow in the garden hose out this far. This will be OK for drip irrigation, but I may need to put a booster on my well.