@"Livin in Sim" - Howdy, sorry it took so long to get back to you.
Let's see if I can reply to all your points... No, I don't have mods. So that was an easy one to not worry about.
The game, for certain sim households with a lot full of planted things, would not allow a gardener to be hired.
I do have the Get Together expansion. And I'm thinking I'll get Seasons in the next few months. I've tried the group thing. People got stuck, and it was not a lot different. More "stuff" did not actually wind up being accomplished.
What I did, was look at it like this. I spent ages on the gallery and never found that lot. Then I took a good look at why it was so challenging. Well, because there were too many of each plant, is why. And since I got it before I got the pet expansion and pack and things, there were plants missing, so a whole small section hadn't had anything in, at all. But still, too many plants. I mean, fifteen apple trees and twelve emotion trees are not really necessary, are they? Two to four of everything else, with trash plants right in the middle, making sims unhappy every time they get near them. Hm.
So I found a garden I liked better, and tried it out in another save, and since more than one sim has picked the dickens out of the one garden, just in case, I'll probably replace it with the smaller one. It has a different feel to it, the plants are a little more spread out, there are quite a few spliced things in there, and there's a big pink tree whose significance escapes me right now, but will be fun to go through the portal thing later on and see what that's about. And I downloaded to my library to make sure I'd got a copy before I got to see if it will be good or weird. And then I got excited and downloaded a garden in a big greenhouse looking thing, and stuck it in the ... not the city living world, but the one with the business lots, and played with it. It's nice. Then just to stay up longer and avoid going to bed for no reason, I started a new sim household, and made her play with plants, and tested the reset business with testing cheats. Turned out I already had it enabled, and it worked well. And even better, she was able to hire a gardener. Interesting. I didn't pay any attention to how well he did, got sleepy and went to bed.
I am wondering, since the one I started playing with at first isn't there, and believe me I looked, maybe it was a buggy thing and isn't there now for a good reason? Anyhow I did go back and fiddle with it, next day, have not removed it yet from the main save, but good grief. It's going to plum in a hand basket. I wonder if making it a cat hangout did something, too? Did the kitties pee ammonia all over the plants and kill them? Does that even happen in this game? I don't think I'll make many places an actual "hangout" now, seeing how they decline to share perfectly fine litterboxes.
I went and did some reading up on Seasons, and I do think I'll enjoy it once I get it. The floral designer career branch looks interesting. And thanks for taking the time to discuss all that with me.