I've had several people ask recently how soon a new seedling can bloom. It all depends...
I have a climbing seedling from Ralph Moore's climbing yellow mini breeder, 1-72-1 crossed with the lovely dark purple shrub, Midnight Blue. It's a very nice plant: completely thornless, lovely foliage and very disease resistant. It is going into its third year since germination and it has yet to flower...once.
Then, you have this kind of thing. This is planted in a four inch pot, to give you a point of reference so you can estimate the size.
This little rose germinated February of 2011, making it about six months old. The seed parent is the russet mini, Suntan Beauty. The "father", or pollen parent, is my thornless shrub, Indian Love Call. My hope was to create a dwarf, repeat blooming, thornless, healthy shrub rose. This one should be repeat flowering by the fact that it has flowered at six months old. Once flowering roses shouldn't flower for another year, or two, from seed.
I love the sepals on the rose and the bud is quite attractive. I know it will be double and it's a very good bet that it will be pink! Not a favorite of mine, but if it's healthy, hopefully prickle free with a nice plant habit and frequently in flower, how can I reject it?
So, as you see, new baby roses CAN flower fairly early in their lives. Anyone want a thornless, healthy climbing rose that won't flower?