Oh wow, thanks for the info.
I have to say, I'm SO relieved after that! So the WA plants weren't added to the super max of gardening? That's odd, cause I had everything in my garden except the steak, death flower, life fruit, and omni plant, and it still said I only had 52% of the plants. No big deal, really; I'm using gardening down the line for another immortal. If I had Ambitions, I could make it his career, too, but business is a good one for gardeners. They can max that career without learning any skills at all, so it's also a good choice later in the challenge.
As a side note, Union Cove is the most beautiful sim town I've ever played. I downloaded it for the challenge, and I think I may never make a new game in any other town! It's amazing, and wroth a little lagging at times.
I found myself just sitting there admiring the landscaping around the river and lakes.