Hi, I've only had mine since this past August. The advice from the Baker's is:
Quote:
Plants are not vigorous and are rather slow to establish. The older portions of the plant tend to die back when disturbed, so they should be divided or remounted only when absolutely necessary.
D. toressae is very slow growing, and many growers consider it difficult to cultivate. Plants are seldom found in patches larger than 4 in. (10 cm).
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This is similar to what I was told when I purchased it.
I think a couple of other people here grow this - and have been growing it longer than I have, so maybe they have a better idea of its rate of growth....