Have you actually visited the lots on more than one occasion Alourra? I think you have to visit some lots to trigger the spawn and then need to revisit them. Just scrolling and zooming in and out while your sim stands in the spot they started at isn't always enough I don't think.
That's good advice, Twinmum. Especially for when you want to find blackberries, which are slow to grow.
Also I'm 100% sure the Space Rock Collection gives the Orchid, as I got that one too. The Aliens one you'll also get while doing missions gives a plaque.
Can anyone confirm that 'The Green Man' mission, which is a lot like Star Wars - (Luke's encounter with Yoda on Dagobah), comes up if you're not in the Astronaut Career? I completed it, choosing to look in the swamp (found him berries) then took the weapon with me against his advice. Upon defeating my doppleganger, I was given a Cow Berry AND an U.F.O. Plant as a reward! Finally!! But I did over 100 missions I'd say, and didn't have this come up until I was playing an Astronaut.
Now that there are 3 plants on my list that I don't have, and 3 known combinations that don't work, I feel like I am just waiting on a patch to perfect the Gardening Guide.
I still don't know what's causing some harvestables to be higher value. Splicing didn't do anything, yet sometimes I reload a game and find my inventory full of high-value plants. I am wondering if it's not also a bug.