Pat and Dan Montague grow all three Petrophytum species in a pot at their Olympia, Washington, garden. Dan gave a short slide presentation on the genus at this month's study weekend. I'll see if I can persuade him to post a picture of his plants -- Pp. cinerescens, hendersonii, and caespitosum.
Bellevue, Washington Zone 7-8
Very cool!! I would love to see it!
From the High Desert Steppe
of the Great Basin and the Eastern
Escarpment of the Sierra Nevada Range
Located in Reno/Sparks,NV zone 6-7
John P Weiser
Here is the picture. P. cinerescens is on the left, P. caespitosum is in the middle (much smaller than the other two), and P. hendersonii with the brownish flowers is on the right. These three species have been growing in this container for many years.
Very nice, I love these plants. :)
John, the seedlings I sent you have not been outside in the direct sun-light. Just thought I would let you know. ;)
Dry garden, little irrigation, 9" precip
Shoshone Idaho USA. Zone 5b-6a
Hot and dry in the summer, cold and snow in the winter.
ClaireWhat a great way to compare Their growth habits. Thank Pat and Don for sharing there wonderful photo.
AaronI'll acclimate them in slowly.
Rock Mat, P. spp. are good(easy) plants for the rock garden, they are moderately slow growers so they are well behaved in this respect. I have grown three species of this plant but I find P. caespitosum is the best of them and have reduced things down to this species. I like the way they form around the rocks where other plants would struggle. The plants smother themselves with not particularly attractive flower spires in late spring, unfortunately they produce a ton of very fine seeds that pop up everywhere though this is little problem since they so grow slowly and can be easily dealt with. I have taken to shearing these plants as soon as the seed set starts so they don't take over the place. I took some pictures this morning.P.caespitosum Two year old volunteer trying to make a go of it
Jim Hatchett, Eagle Idaho USA Zone 5? 11" average annual precipitation
Those plants look great. I can never find any seedlings around outside, but they are easy to sprout. So small the seedlings are they almost look like the start of moss. :)
Looking forward too more of your pics. ;)
Yes! Great plants! I've put seed of the first one on the seed-x. A seedling actually appeared in the scree under the plant: amazing given the size of the things and that they naturally grow on solid rock. This was purchased years ago. The next is one I collected in S.E. Idaho on fractured rock. This enabled me to get a small rooted start, normally impossible for these plants. I call this "june rock mat" because it blooms a full month before the other plant. It is a very nice thing being a bit more glaucus than the first. I'm offering it the entire south face of "The Rock" if it wants it. I've never seen any seed. The third photo is Kelseya. Three seedlings (2009 seed) went into last winter apparently alive. Three seedlings have returned this year. This looks to be the best of them. I will grow this plant.
Very nice! Those are some awesome plants. :)
Petrophytum caespitosum in late August 2012 and an update from the Kelsey Cam ;)