Well that’s spooky coincidence as I was just thinking about these today. I’ve lifted the ones I had in pots and they are currently buried in old dry compost temporarily behind the shed. I’ve decided the imperials only seem to grow better in the ground so planning a big shift and will replant in September. Need to find my persica bulbs too that are already in ground to split them.
I would probably plant them no later than that as the roots seem to start growing early on these if I recall. Will plant the bulb sideways too as that seems to have helped water collecting in that little central hole in the bulb and causing rot.