Just a couple of feet. thomsoniana also has a short spike as does exaltata. I think there is a lot of confusion between some of these species so buy from a trusted grower or buy in bloom so you know what you're getting. That being said, I plan on collecting as many species as I can regardless of space as I'm quite addicted to them at the moment.
I currently have
albopurpurea
exaltata
rosea
thomsoniana
thomsoniana var. minor
humboldtia
superbiens
undulata
tibicinis
I have splendida, wendlandii, and lueddemaniana on order.
Troy
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