[ Lost in the Landscape ]

the dry gardening handbook

Olivier and Clara Filippi have been gardening in the south of France for well over a quarter century. Theirs is a mediterranean climate, and their nursery, Pépinière Filippi, located near Montpellier, specializes in plants adapted to the dry-summer/wet-winter cycles that you find in only five large regions on earth: the Mediterranean zone, proper; South Africa; the southwest corner of Australia; Chile; and much of California.

When I picked up Olivier Filippi’s recent The Dry Gardening Handbook: Plants and Practices for a Changing Climate, I was expecting it to be a different sort of book than it is, maybe something about general drought-tolerant plants, or a volume dedicated to helping your garden adapt to using less water. What this is, however, is a straight book on mediterranean gardening and plants suited to mediterranean climates—something that probably shouldn’t come as a surprise since that’s the focus of the author’s nursery.

There’s a brief introduction to what constitutes a mediterranean climate, followed by notes on the strategies plants use to survive and thrive in it. Good advice on planning, planting, establishing and watering a new mediterranean garden comes next. Then Filippi gives us the heart of the book, a listing of over 400 mediterranean-adapted species, containing common and scientific names, approximate mature plant sizes, and notes on cultivation and propagation. (If you can begin to read French, you can check out the online catalog at the author’s nursery, which closely mirrors the list of plants recommended in the book. There you’ll also find some of the advice that’s offered in the book, although without the nice photos in the book.)

Olivier Filippi gardens in France, and the plant list definitely Eurocentric: lots of different lavenders, cistus, phlomis, for example, with relatively few plants from other the other great mediterranean regions. In fact, many of the non-Mediterranean mediterranean-friendly plants listed are drought tolerant selections from several non-mediterranean climates. For gardeners in dry climates that don’t undergo mediterranean cycles, these suggestions might be some of the best options to try. But those plants might not the be greatest of discoveries: Photinia, heavenly bamboo (Nandina domestica), red-hot poker (Kniphofia sarmentosa) and American gaura (Gaura lindheimeri), for instance, are probably already common offerings in many American nurseries.

One of the book’s most outstanding features is the use of a “drought resistance code” that assigns a number from one to six to each of the species in its plant list. Based on work by plant geographer Henri Gaussen, the number quantifies the number of months of the year a plant can be expected to survive under drought stress. The book also contains instructions on how to calculate the climatic profile of where you live. (I figured out that my coastal San Diego location exerts a 3.5 to 4 drought stress factor. (Edit May 20: I oopsed on my figuring for coastal San Diego. My revised number is a much dryer drought stress factor of 6.)) All that’s a really useful way to understand drought.

When you see plants sold in nurseries and catalogs as drought-tolerant, the description can be meaningless. A variety that would go fine for two weeks without water could turn into seasoned kindling if subjected to six or seven months of continued drying. Realizing that a “drought-tolerant” chamomile plant has a drought resistance code of 2 would begin to tell you that it wouldn’t thrive in the same conditions that would suit California’s more “drought-proof” Romneya coulteri, which has a drought resistance code of 6. Having that information could help you plan companion plantings, as well as help you avoid plants altogether that would only lead to expensive mistakes.

Coming at plantings from a mediterranean focus leads the author to say some choice things about lawns:

You don’t have to be a visionary to see that the traditional lawn is an absurdity in mediterranean climates. If you nurture a deeply rooted feeling that you can’t be happy without a vast, lush lawn, then perhaps you ought to consider going to live in Cornwall… People often imagine that they need a huge expanse of lawn, but all too often the only person who walks over a traditional lawn in its entirety is the unfortunate individual who has to mow it every Sunday.

The author’s solution? Landscaping that pays attention to where you live. For those of you in mediterranean climates, this book can help you develop a deeper understanding of what’s unique about your environment. It can help you come up with good plant choices compatible with what your location offers. Along the way, it could help you save water, reduce pesticide use and maybe even free up some of those Sundays you spend mowing the lawn.

May 16 2009 | Categories: gardening | Tags: books • drought-tolerant landscaping • Mediterranean climate • Olivier Filippi | 7 Comments »

the new spring

Autumn: It’s the new spring.

At least that’s seemingly the case for those of us in Mediterranean climates. With our dry summers and moist winters, the plants best adapted to our climate come close to taking the summer summer off, and then use the onset of cooler, wetter weather to start thinking about getting growing again. Some of the shrubs in the local canyons drop some or all of their leaves in response to drought stress, and most of the wildland annuals disappear not long after the last rains. Our long brown season of summer could almost be confused with the depths of winter in other areas.

Left: Coreopsis gigantea in its defensive, leafless summer mode.

Reading the recent blogs from those other climates, I’m noticing that people are starting to withdraw from their gardens, holing up with some favorite plants transplanted into pots to overwinter indoors. These gardeners are thinking about sitting down with plant catalogs and looking ahead to the holidays, and then to warmer days and the reemergence of their gardens.

[caption id=”attachment_2032” align=”alignleft” width=”300” caption=”Garden after autumn thinning and transplanting”][/caption]

Here in San Diego, however, I started off September by transplanting plants around the garden, readjusting plant spacing and color relationships.

Left: Some of the garden before and after autumn thinning and transplanting.

I planted dozens of little pots of seeds of plants that I want to grow this fall and next year: giant coreopsis, datura, buckwheats from the Channel Islands, mallows from the desert, millet for the birds and some South African restios for a spot in the garden where the original plants haven’t aged gracefully. It’s a frenzy of activity of the sort that people in other climates would associate with late winter and early spring.

All summer, the patches of earth that get almost no supplemental water stay brown and virtually weed-free. Once the rains return, the weeds begin to claim the universe and the weeding chores begin again.

Fortunately, a layer of mulch makes a world of difference in keeping down weed seedlings. Unfortunately, areas where you want to sow wildflower seed can’t be mulched at all if you want the little seeds to germinate on their own. To keep down my workload, this year I’m isolating the wildflower patches to just a couple spots, around a couple little trees that will drop their leaves for the winter. We’ll see how well that works out…

A few spots in my garden don’t have to abide by strictly Mediterranean water requirements. There’s a small herb and vegetable garden that gets moderate doses of water year-round. A new raised bed harbors some tropicals that get to stay moist, as well as some other selections that need a little help with the water. This is the part of the garden that gets to experience summer along with the rest of the world. So the task of weeding never completely comes to an end, although it’s greatly localized to these spots that get watered one to three times a week.

All in all, this 2% of the Earth’s land mass that experiences this Mediterranean climate (the region around the Mediterranean Sea, western South Africa, parts of the Chilean coast, western Australia, and much of California) has its own seasonal cycles that don’t sync up easily with the rest of the world. Gardeners in other areas might not understand us. Forgive us if we have this glaze of anticipation coating our moods these days. Even as we worry about weeds and increased garden chores, fall is here, and it’s the emergence of a whole new season in the garden.

November 16 2008 | Categories: gardening • my garden • rambles | Tags: fall • Mediterranean climate • seasons • spring • transplanting • weeding • weeds | 6 Comments »