@alp Here, Hoya is sold in stores, but everyone prefers to buy from people who are specially bred. Because the buyer can choose a variety. Hoya liana, hoya bush, mottled leaves, white or red flowers ... Perhaps in the UK, too, someone is breeding Hoya.
Funny thing is last fall was the first time I collected my own Impatiens seeds and I have gotten a better germination rate than buying my seeds from South Carolina or here in Canada.
Own seeds are better, of course. They are guaranteed to be fresh.
Do you grow Impatiens from seed only or leave an old plant for cuttings, too?
I am also surprised at the good germination of my seeds. I used to grow begonia from seeds. It has very small seeds. Growing begonia from the seeds - dance with tambourines, as they say. This involves some effort. However, in the winter I found a young begonia in a pot with azalea. I just plant azalea in the garden in the summer, in a pot. This well stimulates the autumn flowering. Next to her grow terry begonias. Some of them spilled seeds. Now I'm waiting to see what kind of a begonia was. I want to see how the seed propagation will convey the varietal characteristics of begonia.
@zigs
On my balcony is also a cactus with buds and strawberry seedlings.

If you put 9 identical coins under a cactus with buds in a red purse, it will bring profit to the house. It really works !!!
