Time to Divide Hippeastrum
That's what I'm doing, repotting Hippeastrum. Those that have not made much new growth and have not flowered so far this spring are my targets.
I have three pots of Hippeastrum papilio. One, my #270, is from a bulb I got from I.B.S. or at least from Charlie Gorenstein, in May 1997. To say that I have neglected it is an understatement! It is blooming right now, probably for the very first time in my greenhouse, and its pot contains all of three or four offsets. That is not much to show for 13 years in my care. It is going to look spectacular, so I will repot it after it has finished flowering and its seeds have ripened. I'll also post a picture here once it has fully opened.
The other two pots are my #1147, which came from the IBS Seed Exchange in 1998. Its parentage: [Lee Poulsen's papilio X Boyce Tankersley's papilio]. There seems to be a total of 10 or so bulbs now, and I think all are from separate seeds in that small batch. One of these is about to bloom right now, the largest bulb, and it is probably the one that was the seed or pod parent of my [papilio x mandonii] hybrids.
I plan to cross papilio #270 and papilio #1147 and grow on the seedlings. I think I have ignored papilio far too long! Brent and Becky have them for under $20 per bulb. Tell them I sent you! (That's a joke; I haven't seen Brent in years, and whoever answers their phone would not have a clue who I was.)
Today I repotted the non-flowering pot, seven bulbs, into individual 1-gallon or 1/2-gallon pots. They were just too crowded, and I hope to get them to bloom more this way.
I also repotted my Hippeastrum argentinum, from the Doran Collection. It has never bloomed for me so far, and the one medium sized bulb had split into about five smaller bulbs. I repotted each of them into their own separate pots. Whereas papilio is evergreen and needs little dormancy to flower, argentinum needs 6 to 8 months of dry rest. It is native to a hot, dry region in Argentina. I have probably not been giving it the correct treatment for dormancy.
Hippeastrum aulicum should not bloom this time of year anyway, so this is as good a time as any to repot it. I have one pot of the regular form of aulicum, originally from Dash in Australia, that has stopped blooming in recent years. I'm sure it needs to be repotted, and I will separate and pot up the offsets at the same time.
My Hippeastrum [aglaiae Clone A x aglaiae Clone C] seedlings have reached bloom size now, and some are already in flower. The two parents have not bloomed in recent years, so they definitely need to be repotted. Maybe I'll do that tomorrow.
I think I should cross my Hippeastrum brasilianum with papilio, too. Both are almost evergreen, and brasilianum is fragrant. Who knows what we'll get? (Well, I'm pretty sure Alan Meerow knows exactly what we'll get, but I haven't seen pictures of his diploid Hippeastrum breeding results, so they'll still be new to me.)
If you have an old Dutch amaryllis sitting around not blooming, try repotting it in fresh potting mix. Clean away all the old dead roots to give the new healthy roots room to grow. Pot any loose offsets up in their own pots; leave smaller offsets attached to the mother bulb until they are about half the mother's diameter. Remember to start feeding each bulb after it starts growing again, and feed it regularly thereafter (see my discussion of fertilizer, Feb. 2010.)
Your bulbs in pots really need to be repotted occasionally. I don't repot mine often enough, mostly because I have too many to keep up with them all the time. I actually enjoy repotting, and I'm missing out on a lot of potential bloom by not keeping up with the repotting.
Good gardening, from here in central Indiana
Look up technical terms in the Glossary of Plant Biology