green immigrants

Here are a few more selec­tions that you might find inter­est­ing from Amer­i­can Per­cep­tions of Immi­grant and Inva­sive Species: Strangers on the Land, by Peter Coates, pub­lished in 2006.

Before Colum­bus brought seeds and cut­tings along on his sec­ond voy­age to the West Indies, North Amer­ica was home to less than 1 per­cent of the world’s total com­ple­ment of cere­als, starches, fruits, and vegetables.

Today, the only crops of sig­nif­i­cant com­mer­cial value native to the ter­ri­tory that became the United States are cran­berry, blue­berry, pecan nut, sugar maple, sun­flower, and tobacco–a fact that offers elo­quent tes­ti­mony to the great ser­vice that has been duly ren­dered by a sting of public-spirited Americans…

No Amer­i­can pub­lic ser­vant since [Thomas] Jef­fer­son deserves more credit for trans­form­ing the for­eign into the com­mon than David G. Fairchild. In his capac­ity as agri­cul­tural explorer in charge at the Sec­tion for For­eign Seed and Plant Intro­duc­tion from 1898 until 1928, Fairchild brought the navel orange to Florida and Cal­i­for­nia from Brazil and over­saw the intro­duc­tion of Italy’s seed­less grape and China’s dry land pis­ta­chio. His most notable con­tri­bu­tions, how­ever, were in the intro­duc­tion of the Chi­nese soy­bean and…the tree that became an essen­tial prop of Wash­ing­ton, D.C.‘s mon­u­men­tal land­scape, adorn­ing the Tidal Basin: the Japan­ese flow­er­ing cherry tree.

Fairchild’s encoun­ters with the infa­mous vine that “ate the South”…left him some­what chas­tened. He first came across kudzu about 1900 while tour­ing Japan, where this wild, semi­woody peren­nial was fed to live­stock. In his auto­bi­og­ra­phy he recalled a visit to a “kudzu enthu­si­ast” in Chip­ley, Florida, who was renowned for singing its praises as a for­age crop in the early 1900s, despite his neigh­bors’ dis­trust. “When­ever I think of that night’s talk with the kudzu pio­neer,” recalled Fairchild, “I have a spe­cial feel­ing of pride in what might be called our Amer­i­can will­ing­ness to try some­thing new, whether it be a new for­age crop, a new food, or any one of a thou­sand new, machine-made gad­gets.” Fairchild, who con­fessed that “per­haps I have an undue pas­sion for the new,” retained his faith in kudzu for quite some time, despite its pro­cliv­ity to spread at will. By the late 1930s, how­ever he was express­ing his grow­ing reser­va­tions in print. The seeds he brought back from Japan and planted on his prop­erty in Florida “‘took’ with a vengeance, smoth­er­ing every­thing they got onto, and pretty soon we became alarmed. Feel­ing that the kudzu was too much for us, we began to cut it out.”

Fairchild finally returned home, so to speak, in 1946, when invited to make his selec­tion for the “My Favorite Tree” guest col­umn in the jour­nal of the Amer­i­can Forestry Asso­ci­a­tion (the nation’s old­est con­ser­va­tion orga­ni­za­tion, founded in 1875). After men­tion­ing a string of exotic also-rans, but dis­card­ing them as unsat­is­fac­tory, he recalled that he had seen his first grove of Cal­i­for­nia coastal red­woods (Sequoia sem­per­virens) fairly late in life, at a time when he was still besot­ted with exotic Asi­atic promise: “A feel­ing of utter paral­y­sis over­took me and the pas­sion for plant­ing trees, my puny lit­tle trees, any­where, became distasteful.”

The sto­ries in the book are great, and the social com­men­tary is com­pelling. Unfor­tu­nately, every now and then a botan­i­cal clinker drops into the book’s pages, such as the one that fol­lows the quote on red­woods imme­di­ately above, where the author waxes, “Though the red­wood is only really found in Cal­i­for­nia (there is a tiny patch in the most south­west­erly cor­ner of Ore­gon), it is arguably more Amer­i­can than any other tree in the United States inso­far as it has no rel­a­tives, near or dis­tant, in any other coun­try.” Like, um, what about the Chi­nese dawn red­wood (Metase­quoia glyp­tostroboides)?

Okay, this isn’t a book you read for the botany, but it’s a wor­thy and thought­ful work on plants and the human con­di­tion, per­fect for late win­ter read­ing as you con­tem­plate the impend­ing bloom­ing of your cherry trees.

Although it’s pri­mar­ily about bio­log­i­cal immi­grants to North Amer­ica, Peter Coates points occa­sion­ally out that the immigrant-carrying boats sailed both directions:

The native oaks of Britain and the United States were greatly admired by J.C. Loudon, a lead­ing British hor­ti­cul­tur­ist of the mid-nineteenth cen­tury. He pro­nounced them “the most beau­ti­ful of trees.” Yet exotic trees had already become a manda­tory ingre­di­ent of the “polite” British land­scape enclosed within pri­vate estates. Loudon him­self was one of the trend­set­ters who insisted that, notwith­stand­ing the oak’s charms, “no res­i­dence in the mod­ern style can have a claim to be con­sid­ered as laid out in good taste, in which all the trees and shrubs employed are not either for­eign ones, or improved vari­eties of indige­nous ones.

The most sought-after of these arbo­real exotics were hardy North Amer­i­cans. Britons were ruth­lessly con­de­scend­ing toward Amer­i­can artis­tic achieve­ments at this time. “In the four quar­ters of the globe,” Syd­ney Smith famously inquired [in 1820], “who reads an Amer­i­can book?” or goes to an Amer­i­can play” or looks at an Amer­i­can pic­ture or statue?” Yet no one asked “who plants an Amer­i­can tree?”

February 10 2009 | Categories: gardeninglandscapelandscape designquotes | Tags: | 3 Comments »

wild and out of control

All over town here in San Diego you see the black mus­tard plant, Bras­sica nigra, now approach­ing the end of its bloom­ing period.

The undu­lat­ing yel­low mounds of it doing its thing are a spec­tac­u­lar sight, so much so that Napa Val­ley, up north in the wine coun­try, has an annual Mus­tard Fes­ti­val that’s just come to its con­clu­sion. The fes­ti­val host the expected Napa wine and food offer­ings, and also hosts con­tests in pho­tog­ra­phy, art and cook­ing with mus­tard. In addi­tion to how the plant looks, it has an inter­est­ing his­tory, as told by Napa pio­neer Calvin Chester­field Grif­fith, quoted on the Mus­tard Festival’s site:

This is the story of our early Cal­i­for­nia when it was only a wilder­ness, with great quan­ti­ties of trees, beau­ti­ful plains, all kinds of wild ani­mals and birds; many, many Indi­ans, and no white men at all.

Father Serra had come from Spain to Mex­ico to spread the reli­gion of Jesus Christ, and hear­ing about this beau­ti­ful, vast coun­try to the north, decided to explore it. With a few faith­ful fol­low­ers and Indian guides, he trav­eled north through what is now our glo­ri­ous and loved Cal­i­for­nia. As he trav­eled he scat­tered to the right, and to the left, the mus­tard seeds which he had brought with him from Spain.

The fol­low­ing year, as they returned south they fol­lowed ‘a rib­bon of gold;’ and fol­low­ing that path again Father Serra estab­lished his ‘Rosary of Mis­sions,’ begin­ning in San Diego and end­ing in Sonoma.

It’s an appeal­ing, roman­tic story, but it also side­steps the fact that the mus­tard has invaded much of the West, and can be found in most of the United States. As a robust win­ter annual, it can out-compete most native plants, par­tic­u­larly in dis­turbed loca­tions, and form vir­tual mono­cul­tures that pre­vent other plants from get­ting a foothold. The pic­tures above were taken a few blocks from my house, in Tecolote Canyon. Because of abun­dant mois­ture ear­lier in the year, the plants were well over my head in spots, eas­ily seven feet tall.

To the left is a pic­ture of a part of the canyon where the mus­tard hasn’t taken over. It’s a good exam­ple of coastal sage scrub, rich in plantlife and alive with birds and insects. The white-flowering plant in the fore­ground is black sage, Salvia mel­lif­era, bloom­ing up a storm, with yel­low deer­weed (Lotus sco­par­ius) behind it. So what would I prefer–a rich eco­log­i­cal mix of plants that host a range of ani­mal life, or a showy burst of color that nour­ishes almost no ani­mal life and is about to dry out to a wild­fire magnet?

Alert on a new inva­sive: Cousin Jenny, a new Mas­ter Gar­dener in South Car­olina, alerted me to a new inva­sive plant, cogongrass, a plant that’s being listed as a treat even worse than the suf­fo­cat­ing kudzu. Here’s a link to a story in the Beau­fort Gazzette. Like the black mus­tard, it’s an attrac­tive plant, but it’s also seri­ous bad news.

More on weeds and inva­sives: I’ve been leaf­ing through Weeds of Cal­i­for­nia and Other West­ern States, by Joseph M. DiT­o­maso and Eve­lyn A. Healy. It’s a sump­tu­ous two-volume set, a coffee-table book of weeds if there ever was one, with 3000 images of the 750 evil species it lists. It also comes with a CD-ROM of the images in the book that can be used with­out roy­al­ties for edu­ca­tional purposes.

In addi­tion to the 750 nas­ties, there’s a table in the back with poten­tial future threats from plants that are just enter­ing the ecosys­tem. The book leans towards the tech­ni­cal side, but there’s a handy glos­sary and index. It took me 20 min­utes to fig­ure out that the annoy­ing grass com­ing up in spots around the yard was tall veld­grass. But with other species I was able to go right to the offender.

I found it strik­ing that a huge num­ber of the weeds–like the black mustard–were of Euro­pean ori­gin, likely brought over by set­tlers from there over the past cen­turies. Con­trols have since been erected that help reduce the entry into the coun­try of plants that might prove inva­sive. How­ever, with peo­ple, prod­ucts and pro­duce jet­ting all around the world these days, it’s inevitable that there will be waves of invad­ing plants from regions other than Europe. The cogongrass that’s of con­cern in the South, for instance, comes from Asia.

As I wan­der around the yard inven­to­ry­ing the plants com­ing up in the crevices, it’s weirdly com­fort­ing to know that my yard is con­tribut­ing to pre­serv­ing the earth’s bio­log­i­cal diversity–though unfor­tu­nately I’m not nec­es­sar­ily help­ing along the species that really need it the most!

May 03 2008 | Categories: landscapeplant profiles | Tags: | No Comments »