DryStoneGarden

ribes sanguineum & physocarpus capitatus

I didn’t get the greatest photo, but I find this juxtaposition pretty funny. First off, it’s a mistake on several levels. It’s in a planting outside a sub-development, and I’m sure that a landscape architect designed the planting with all Ribes sanguineum (flowering currant), but the contractor accidentally installed one Physocarpus capitatus (Pacific ninebark). There’s only one ninebark in the whole planting, and the two plants look similar when young so it would be an easy enough mistake to make, and there’s no way someone would intentionally plant this–it looks like Two-Face from the Batman series. There’s also no way anyone should have hedged these plants, but for some reason people seem to think it’s appropriate.

The mistake does make for an interesting, if slightly unfair, comparison. When they are not hedged, ninebarks have beautiful new foliage in the spring; the new leaves have almost the same effect as flowers, and the flowers are nice when they come later in the year. The plants are fast and tough and a good native habitat plant. I like them; we have one in our own garden. But they are not for every garden. The form is kind of rangy and thickety if you don’t prune it frequently, the bloom should be deadheaded, and the leaves can get tired and yellow by mid-summer with no fall color before they drop.

And ninebarks just can’t compete head to head with a Ribes; few things can. Ribes sanguineum is beautiful and native and fast and tough and a great habitat plant, and it will thrive in virtually any spot where you’d put a ninebark. It’s good for habitat and genetic diversity reasons to plant the ninebark (most Ribes in retail nurseries are from just a few cultivars), but most people, and most clients, will prefer the Ribes. We do plant ninebarks- like I said, we’ve got one in our own garden (along with two Ribes)–but we’ve probably installed six or eight Ribes for every one ninebark. I’m sympathetic to the native plant enthusiasts who want as much diversity and habitat value as possible in gardens, but sometimes it comes down to just looking at two plants side by side and picking. Fortunately, we don’t always have to pick between the two, and we do sometimes find gardens for ninebarks. Ninebarks are nice, they just aren’t awesome.

I put a few photos of the hedged ribes mound that the landscape architect was intending. I don’t really understand the urge to turn two perfectly nice Ribes shrubs into a single Ribes shrub mound. (more…)

Roots!

But it feels like most people plant them as if they were. We see tons and tons of sick, unhealthy plants, especially trees and shrubs, that have been planted by well-meaning, and sometimes even professional, gardeners who bury the root crowns of the plants. It’s reached the point that we automatically check if the crowns are buried whenever we look at someone’s garden. Nine out of ten times, if a tree is sick, the crown is buried. I’m not sure why people plant that way. I probably did it years ago, too, but I don’t remember the thinking behind it. I guess the plants seem more solid when their trunks have a lot of dirt holding them in place. Also, I think it might be because people’s first gardening experience is with a tomato.

Tomatoes are one of the few plants that actually benefits from having the root crown and stem buried. If you bury the root crown (the spot where the stem or trunk meets the soil and starts to put out roots) and the stem of a tomato plant, the branch nodes will form new roots and you’ll get a more vigorous plant. If you bury the root crown or stem of most other plants, the stem will slowly rot and the plant will die. It can take a long time, sometimes years, for a plant to die from a buried crown, so a well-intentioned gardener might never learn why their plants tend to mysteriously kick the bucket. It’s the most common cause of problems when we consult on sick plants, and I have a theory that it’s one of the most common causes of black thumbs. I know at least one black thumb gardener who was losing plants for that reason.

A few plants, like tomatoes, benefit from being planted a bit deep. I have a short list, which I hope to add to over time, of those plants below. Let me know of any I should add to the list. (more…)

I’m hoping this photo from last fall will sell my Mom on some gravel. She’s been resistant to the idea of using gravel in her yard, but I think she’s picturing gray construction gravel. I probably need to start calling it Tuscany Gold, the way they do at the stoneyard, make it sound more stylish. The Tuscany Gold looks a bit mediterranean/southwestern for her taste, but gravel has some advantages over flagstone, mainly that it drains well and it’s inexpensive and easy to install and maintain. It’s not so good for patio furniture, it’s not as nice to walk on, and it can get stuck in the soles of your shoes and scratch the hardwood floors, but none of those issues would be a problem for that section of my parents’ yard where they want to take out some lawn. And I think the ease of installation should trump everything in this instance. A mother shouldn’t want her only son carrying a ton of flagstone into the backyard.

ryan 3/4

The blues in the striped agave and Festuca californica are a pretty obvious match. Festucas look really nice this time of year, especially next to Arizona flagstone and terra cotta pots. We put the agave there to stop me from stepping across the narrow planting bed. You can’t really top agaves for crowd control.

Three Rivers Flagstone

One of our clients calls Three Rivers flagstone “purple zebra,” which is a pretty accurate description. It always catches our clients’ eyes when they visit the stoneyard, though they often balk at the price, as it became really expensive a few years ago and is probably the most expensive flagstone commonly available in the Bay Area. It’s from one of the largest flagstone quarries in the United States, located up in the Sawtooth Mountains in Idaho. The quarry wanted to expand and the Bush administration, in their inimitable way, told them to go right ahead and not worry about doing an environmental impact study. An environmental group, the Western Watersheds Project, which owned a wildlife preserve adjacent to the quarry, then sued, and a judge agreed with the environmentalists that yes, U.S. law does require environmental impact studies, and temporarily shut down work at the quarry. Everyone settled out of court and the price then went up a couple of hundred dollars to around $750/ton.

I’ve seen the stone described as a type of quartz-sandstone and as argillite. Answers.com defines argillite as “an intermediate between shale and slate, that does not possess true slaty cleavage,” which sounds about right, except that I would add that Three Rivers is really hard and heavy. (Can I say that I prefer my stone with a bit more cleavage? It’s true. Cleavage is the tendency of stone to break cleanly.) The swirls of color in Three Rivers come from irregular mineral layers which look cool but make the stone inclined to break irregularly. The patio in the photo, for instance, has rougher, wider joints than I would do with a cleaner-breaking stone like a sandstone. To get tight joints with Three Rivers, you pretty much have to cut everything with a saw. We usually only use Three Rivers for stepping stones, paths, and small patios; it can look too busy when used for larger areas.

Quarriesandbeyond.org has links to info about the Three Rivers quarry on their list of quarries in Idaho.

Three Rivers Flagstone Patio

tenacatita, mexico

Beach front property in Tenacatita, Mexico, south of Puerto Vallarta. I like the juxtaposition between the permanent stone foundation and the more transient tent and palapa. Tenacatita has various parties making claims on the beach front property, so no one has been willing to invest money into developing it. Some day, no doubt, a developer will line the beach with condos, but in the meantime it’s a winter home for migratory Canadians. I have a few photos of walls from the area below.

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