Yeah, I never got any kind of CC plants myself.
I got to play a little last night, and confirmed that I absolutely cannot trigger any Destroy Object command. MCCC -did- have the Testing Cheats already enabled. Enabling them again made no difference. I can't destroy the plant. In fact, I can't destroy hardly anything with that command...I never actually see it on anything, on my lot or off? Are you sure that's the cheat that enabled that command? In this game? I think I remember it doing that in the Sims 3, but I'm beginning to realize I haven't seen that option in months of playing, if not over a year by this point, and those cheats are always on with MCCC.
Also, here's some screenshots showing the problem and the location:
In the bottom-right corner of this planter, you can see the snapdragon (which was highlighted with my cursor on it) and floating above it are the dandelions that used to be there. Their bush isn't there, but the flowers are...and I can't do anything with them.
Zoomed out further, this is the plot of land they're on, that's accessible from our house, but very much so out of our lot bounds. (Planter box with issue is circled)
Yeah, my house is very far to the right. There's a bridge JUST off-camera to the right, and it's across that bridge to the right.
From the looks of things said here, it looks like all I can do now is hope for an update and fix. But I wanted to update to at least mention the Destroy Object thing is apparently not an option.