Rosa Rugosa seedlings question

Good Morning, I am a newby in gardening and on this forum. I have three seedlings of this rose, on the seed packet it says that I have to allow to grow on for 2 years before planting out. The little pot looks already crowded to me, should I follow the advice on the packet or should I repot each one, perhaps not in situ but in a larger pot? Thank you.


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In the sticks near Peterborough