It doesn't matter how many times you harvest the yeild on rare and uncommon plants it like 1 out of 600. So it's just super challenging to get since the new update. I have yet to get the Bird of Paradise and Orchid to grow on my spliced plants but I did finally get Pomegranate, but it took like half my sim life to get it and I was playing on long.
This is from Carl's Sims 4 guide in regards to the update and grafting:
"It is important to note that rares and uncommons now have a small chance of spawning when you've done the correct grafting combo. This is currently an intended design and not a bug. For any given harvestable you have a 500 weight for common, 100 for uncommon, and 1 for rare. This means 1 out of every 600 harvestables will be a rare".
I think it is ridiculous. You might have better luck getting them through rare fishing spots. Other simmers have said that the best place to fish for them is at Magnolia Promenade. I haven't tried it but I'm about to bcuz I'm tired of waiting for them to spawn on the plant.
Also I got a tomato, onion, and grow fruit from buying them in Granite Falls. I have been waiting and visiting the locations where these are at to no avail they're just not growing in world no matter the season. I even spent a couple nights in forgotten hallow talking and looking at the plasma tree and still has yet to wield any fruit. At this rate I feel my sim family won't complete the gardening collections before they die or without cheating.
