Grow Rugosa cultivar from seeds in the hips
My neighbour has a row of 5 tall and beautiful Rosa Rugosa cultivar. They bloom profusely once in the Spring with heavenly scent. The later summer blooms are only sporadic and not fragrant. It produces a number of red rose-hips. After a cold winder of many freezing days, I collected 3 hips yesterday April 30. Two are still orange and one is grey. I opened the hips. The orange ones contain light brown-coloured seeds. The grey one contains dark brown seeds. The coat of the seeds is shiny and woody - see pictures. There is a line on each seed. The seeds look full and viable. However, I placed these in water and the seed float on top of water. My questions:
1. Do I still need to place these in the refrigerator before I attempt to germinate them?
2. The seeds were exposed to freezing and dry conditions in the hips. Will they still germinate?
3. Do they require darkness to germinate?
4. Will soaking the seeds in hot water help them germinate?
5. How long does it take for them to germinate?
I am hoping to have a few large shrubs in a section of my yard.