Grafting plants around winter time, Botanist career

When I want my sims to do a lot of gardening (especially for botanist career, but also sometimes for sustenance or crafting skills), I always have at least a few plants in pots indoors (greenhouse or just a corner of a room) so they produce a little less, but do so year-round. Plant a couple of things inside, and after a few days, you should be able to do every interaction on those plants.

I found a problem, I had to splice a plant first.

Yes, you have to take a cutting from the plant then graft the cutting onto another. You also have to lvl 5 of the garden skill.