I have 2 kingianum from a fistful of keiki's I was given; one in PrimeAgra and the other in Hydroton. They're growing side-by-side on the sill with same treatment. The PA plant is much fuller and greener than the Hydroton plant, and is putting out new growths again like crazy. The hydroton plant hardly grew at all last year and I don't see any signs of new growth yet this year.