I’ll be able to tell you soon… my little WR x Mutabilis seedling is just starting to pick up and grow a bit 
At the moment it is still very small. It almost went unnoticed as it was the smallest seedling ever. It just appeared as these tiny little leaves that I thought were weeds and then just sat there for so long. Then it started to grow and I was thrilled!!! It is receiving a little extra attention at the moment