Can anyone give me advice how to grow Rosa 'Osiris from seed? Having looked online it would seem they are very hard to grow from seed as they are prone to disease etc

Karyn, it is impossible to grow Osiria from seed. It's a hybrid rose and will not grow from seed. Any seller of Osiria seeds is a scam artist.

As for the rose's disease resistance, it is virtually nonexistent. Osiria is highly vulnerable to various rose pests and diseases when it is grown from cuttings and even when it is grafted.

Thanks for your advice Zuzu, thats Ebay for you. Im glad they didn't cost very much.

If you already have them, I hope you plant them just to see what you get.

I certainly will Porkpal and I will upload a photo so we can all have a laugh as it will probably be a weed lol

Rosarians are the perfect candidate to back breed a plant. Huh? Wah?

Break out your favorite seeds, and wintersow all of them. Tease any survivors out of their WS container and into cells. By year three; you should have bloom and an established growing habbit.

Select those that most closely match the parent (seeing as each rose could have eight or more ancestors 'close" may be in the eye of the beholder). Trade-give away-behead the culls.

You can now hand pollinated rose (and segregate them in a muslin bag). Repeat enough times to refill your seed stash. These will be your F-1 generation.

By F-4 you will either be closing back in on the rose that got you started, or will be off on a new tangent.

All of your friends will avoid you and your garden.

Thanks Coppice, I will certainly sow the seeds in a germinator and go from there, I don't really understand what WS, F1 to F4 means sorry I am a beginner gardener and didn't/should off understood before I bought the seeds lol so I guess I'm stuck with dud seeds and will just do my best and see what the outcome is and will then upload photos possibly in ten years lol

Thanks again for your advice 😀😀

I grow rosa rugosa from seed yearly. In fact am due to pot into cells this years WS babies soonish.

Thanks @coppice do you have any advice as I've never grow roses from seed and in actual fact I've only grown a couple of plants from seeds once and that wasn't a great success 😳😳

Rose is pretty much like any woodland plant. It makes a really hard-coated seed that does best by never being dried. Clean your seeds out of the hip ones its color changes away from being green. Take still-damp seed and put it in with some barely damp peat moss in a ziplock bag, put your seed into the fridge (not the freezer). Plant them as you would any other wintersown seed (see winter sowing forum).

Eventually spring will come, seed will germinate. You can tease them out of their milk-jug or tote when they have at least their second set of true leaves. Its still going to very tiny.

Grow it in pots or cells till it gets big enough. Often at least a year.

Rose' percentage of germination can be all over the map. Irrespective of your skill at germinating them. My fix is, more is more. I put a half a cup of seed into a jug. Most years I will get more than 100 to germinate. I put two seedlings per cell.

If you are breeding, you're going to have to select for your traits, and propagate or graft the ones that make your grade. Give away or sell the culls.

I don't breed rose. Its just easier to grow rosa rugosa from seed. The hardscrabble gardeners that want my rose usually want them for hips, for food, or herbal uses.