I think about these things as I peer into my coffee cup…

This winter, we’re working on renovating part of the campus Hort Garden. We’re tossing around lots of ideas/themes, but I’m leaning towards a garden full of “Plants with a Purpose”. Edible, fiber-producing, medicinal…you get my drift.  Which brings me to today’s bloggerific topic: beverages.

Mankind has, throughout history, infused or fermented just about every species of flora in an effort to get either perked up or calmed down.  These plant potions are often classified anthropologically as, ahem, “ceremonial beverages”. The species that we currently rely on for our daily ups and downs are not native to North America.  But that’s not always been the case.

Way before the joys of coffee hit these shores, there was the Yaupon holly (and I am partial to hollies). This thicket-forming evergreen shrub likes “wet feet” and is usually found in marshy areas in the piedmont and coastal plains of the southeast.  Translucent red berries grace the female plants in winter – hollies are dioecious, meaning male and female flowers reside on separate plants.  The fact that Yaupon is one of few native plants to contain caffeine was picked up on very early by Native Americans – a potent tea brewed from the leaves was called the black drink.  Though the scientific name Ilex vomitoria might indicate some unpleasant side effects, it only exhibits emetic properties when a ridiculous amount is consumed.

Sassafras (Sassafras albidum) has been used as both a flavoring and as the main ingredient in teas and soda.  The sassafras is a sweet little understory tree, with oddly and variably shaped leaves – with one, two, or three lobes – Dr. Dirr at UGA pointed out to us that they often resemble “racoon mittens”  Native throughout the Appalachians, the tree roots were dug up in early spring before while still loaded with sap (where’d ya think they got the name “root beer” from?!).  Safrole is the  phenolic compound that produces the characteristic flavor.  However, safrole is now considered a carcinogen and the FDA banned the sale of sassafras for human consumption in 1976.  Extracts used in food and beverages have to be “safrole free” – produced through a commercial process. It’s also a psychoactive compound.  This may explain Yosemite Sam’s obsessive-compulsive tendencies and Saturday morning profanity (and I quote)  “Rassan, sassan, sassafrasan…”.

Last in today’s line-up of stuff from the woods: Humulus lupulus (the vowel-heavy name for hops).  Mmmmm, hops.  Here ye, the one or two people that may not know this, that from hops cometh the essential oil that maketh beer yummy. Speaking of oils, get close enough to hop vines on a really warm day and you’ll get a whiff of why it’s in the family Cannabaceae.  This perennial vine is native to most of the Northern Hemisphere.  The European beer-making strains have naturalized – that is, has spread from plants brought over by colonists in the mid 1600’s.  Hops are also dioecious – the female flowers are papery cones about the size of a quarter and the source of all hoppiness (the male flowers are basically useless and just sit around with their feet on the coffee table).  The leaves are sandpapery and most have three lobes – sort of reminiscent of a grape leaf.  Not only useful to make ceremonial beverages, the vigorous leafy vines provide an excellent screen and can quickly cover up an unsightly fence, shed, or family member.  Now that’s a useful plant!


I spent so much time writing this I ran out of time to hunt for plant photos. So here you go: My traveling T.Rex enjoys a nice, hoppy Virgin Islands Pale Ale on a lovely beach in St. John.

Carrot-top syndrome in white pine

I know a few folks out there are starting to believe that I’m just an apologist for the nursery industry.  While it’s true most of the nursery people with whom I work are hard-working folks trying to do their best to run a successful business and produce a quality crop, there are certainly some issues out there and I’ve got my share of pet peeves.  One of the things really that chafes my heiney is what I refer to as “Carrot-top” syndrome in eastern white pine (Pinus strobus).  White pine is one of the most commonly planted conifers in this part of the world.  White pine is native throughout much of the eastern US and is an extremely fast growing tree that makes a good ornamental when planted on the right place with room to grow.  It is also widely grown as a Christmas tree in the Upper Midwest as well and therein lies the rub.  Many nursery producers also grow Christmas trees and many Christmas tree growers also dig nursery stock.  The result?  White pines that have been heavily sheared as Christmas trees end up planted as landscape trees.  Once in the landscape, the upper portions of the trees will quickly resume rapid growth, with some shoots growing 2’ to 3’ or more per year; while the side shoots that had been repeatedly sheared barely grow at all.   After a couple of years the net result is neatly trimmed Christmas tree with a wooly beast growing out of its top.   What’s the solution?  Ideally producers should identify which portion of their trees will be sold as Christmas trees and which are destined for the landscape trade.  Christmas trees can be sheared to meet demands of that market while landscape trees can be pruned much more lightly to maintain a single leader and conical form but keep obvious layers of whorls.  The dilemma, of course, is that growers don’t always know which trees will end up and the Christmas tree lot and which will be dug for the nursery trade.  The other, more challenging problem is that, given a choice, 99 out of 100 garden consumers will choose the neat-looking Christmas tree for the landscape, unaware of the wooly mess that’s about to be unleashed in their yard.  The solution?  Education on both sides; making growers aware of the issue and making consumers realize that the only way to have a natural-looking white pine in your yard is to start with a natural-looking white pine.


Heavily sheared pines will retain the outline from from shearing for years while the top rages out of control.

How on Earth Did I Land This Gig?!

Linda referred to my recent absence from the blog – but it was in the name of education, I swear!

Cocos nucifera, the iconic coconut palm.  My office for the past two weeks. Or a Corona advertisement. You pick.

This study abroad to the Dominican Republic sent Virginia Tech students (mostly biology and natural resources majors) to the Punta Cana Ecological Foundation for the entire semester, with faculty rotating in for two-week stints on topics from ornithology to geography. My topic was “tropical horticulture”.  The professor previous to my session had to cancel his trip; by the time I arrived, the un-chaperoned students had basically gone feral.  Corralling them with promises of beer and French fries, I coaxed them out onto plant i.d. walks.  By the time our field trip to the national botanical garden rolled around, they were blurting out plant names left and right.  Made me proud!

Identification walk featuring salt-tolerant plants. That’s red mangrove, Rhizophore mangle, on the right. Feral students on left.

The ecological foundation’s shade houses, orchard, and organic veg gardens grow some of the produce for the resort and made for a great learning experience (unusual greenhouse pest problem: tarantulas).  I’ll post more tropical plant pics and factoids in January – when we’ll really, really need to see them.

Morinda citrifolia, better known as Noni.  Though chock full of vitamins and all manner of secondary metabolites of medicinal interest, the smell of ripe Noni is comparable to Limburger cheese left in the sun for several days.  Shrieks of “NONI!!!” meant someone was about to get pelted with over-ripe fruit.

 

Graft and corruption

It’s election season – but that’s not why I’m doing a blog on “graft and corruption.”  Instead, let me back up and explain that today I gave a seminar on diagnosing urban tree death.  One of my points to the group was the importance of knowing the history of a site – what species were selected, how trees were planted, whether there had been any major construction activity, etc.  I thought I’d continue the importance of site history into today’s posting.

Here’s a photo of a street tree – a Prunus spp.  (Disclaimer: I am not endorsing a candidate for Mayor of Seattle despite the appearance of a campaign sign in the photo.)  It’s a healthy enough specimen, though possibly a bit large for this narrow planting strip:

Several years ago you would have seen a different tree in this same spot:

Now did this weeping cultivar somehow transform into an upright form?  Let’s look at this second photo in its entirety:

This reminds me of my favorite childhood book on Greek mythology, which had a great drawing of Athena springing from the head of her father, Zeus.  Yes indeed, we are seeing the scion of a grafted tree lose the battle to the rootstock.  Rootstocks, by their very nature, are vigorous.  If we revisit the first photograph again, this time a little closer, we can see all that remains of the poor scion:

Lesson:  if you are using a grafted tree in the landscape, you need to keep the rootstock under control.  Grafted trees are probably not good choices for low-maintenance landscapes.

Where the Buffalo Roam

Just kidding. We have no buffalo on the campus of Virginia Tech, just lots and lots of students with the flu. Yuck.  But this is much more interesting:

Bouteloua dactyloides (bless you!), better known as buffalo grass:

We’ve recently added a 1-acre meadow to our on-campus teaching and display garden (the Hahn Horticulture Garden at Virginia Tech).

Native trees, shrubs, perennials,and grasses surround a central lawn of buffalo grass. As one of the components of tall- and short-grass prairie, it is a popular forage in the west and midwest. Toughness and no-mow-ability makes buffalo grass a candidate for the low-maintenance lawn. We chose the cultivar ‘Bowie’, which has been reported as a good choice for the Mid-Atlantic…more cold and moisture tolerant.  But it’s not cheap – ran us $15/lb with a seeding rate of 3lbs/1000 sq ft. We ordered 1/4 acre’s worth. Our horticulturist Paul calibrated the spreader not once but three times, and was still nervous.

We’re pretty happy with the progress – it’s filling in nicely after 18 months. Once established, buffalo grass will pretty much choke everything else out, but until then, broadleaf weeds and crabgrass are a bit of a pain. Extremely drought resistant, it also handled this year’s surplus rainfall with no problems.

The best way I can describe it is, er, cute!  It’s so fluffy, and forms pet-able 6″ tall tussocks with little seed heads dancing about. One just might, after a hard day of academia-induced anxiety, want to lay down in it and make a “grass angel”.

We’ve already had a light frost, hence the tawny color. This presents a teaching opportunity:  most of the turf around here is tall fescue or blue grass – fairly evergreen, cool-season grasses. Buffalo grass WILL turn golden-brown in winter, and we’ll get lots of questions as to whether or not our meadow is “dead”.  No, it’s just resting!

If you’re thinking of trying buffalo grass or something other than run-of-the-mill turf for your lawn (or even ripping it out altogether), check out ideas from Susan Harris and friends at www.lawnreform.org

Moo... So there's a weed or two...

RAWRRR!

Posted in honor of Garden Rant’s Halloween-related garden photo contest.

Pick me, Amy, pick me!!!



Now For The Scary Part

This little dude is the Florida Semaphore Cactus, native only to hardwood hammocks in the middle and lower Keys. According to the Center for Plant Conservation, Opuntia corallicola may very well be the most endangered plant in the United States.”  Only one wild population remains (eight individuals), plus a few sites of re-introduction. Loss of habit and an exotic cactus moth have contributed to the demise of this most personable of cacti.

Arbitrary travel tip: I snapped this photo during a recent visit to the fabulous Key West Tropical Forest & Botanical Garden. Please pay them a visit if you’re ever in the vicinity – they are doing so many great things, with so little $$$, as is the case for many small public gardens. And then head straight to Kelly’s on Whitehead Street for outstanding $3 margaritas…served in a pint glass!

Alternatively:  "Aieeeee!

The Heartbreak of Plagiotropism…

…Otherwise known as “splayage”. When vegetatively propagating some species of woody plants, care should be taken when selecting where to take a cutting (piece of stem) to root.  Propagation from terminal cuttings (pointy end up) usually results in orthotropism or a vertical growth habit.  Cuttings from extremely lateral branches (those that grow parallel to the ground) can, in a few species, result in a spreading growth habit or plagiotropism.

This is not always undesirable – some species are purposefully propagated this way to maintain the prostrate habit that particular cultivar is known for. I’ve propagated lots of Buddleia over the years and don’t recall having this happen. Jeff, you were “Mr. Buddleia”* back in our days at UGA…please weigh in on this!

Floppulence
Buddleia davidii ‘Santana’, author’s garden.

Said plant was purchased from a little Mom & Pop greenhouse as a 4.5” pot with a 6” tall rooted cutting, and it went into our garden in May. It is now lolling all over its neighbors like a drunken sailor.  What looks like a vertical piece in the back is simply propped up by the Canna. No big deal, just a good teaching moment.

‘Santana’ is a bit slower-growing than most cultivars of Buddleia, yet is in great demand due to the wacky variegated foliage. My guess? This is the result of repeated acts of propagation via lateral branches…cuttings of cuttings of cuttings. Not to mention the fact that it’s patented, so this guy may not only be floppy, but illegal (!). One of the purported upsides of the plant patenting process is to control the quantity and quality of propagation through licensing. But that’s another post topic for the future.

*Not to be mistaken for the pageant winner “Miss Buddleia”

More Good Stuff from the Garden Writer’s Conference in Raleigh

I should add “in absentia”… Played hooky from the convention center Thursday afternoon for a trip out to Plant Delights Nursery, Inc. with my former grad student and plant geek extraordinaire, Paul Westervelt. We followed proper Plant Delights etiquette: you make an appointment to visit at a time other than open house or tour. I teach herbaceous landscape plant i.d. as well as ornamental plant production courses, and take every opportunity to bring back images of new technology, growing systems, and great plants to my students.  Since Paul is a now a grower for a large nursery, he’s also keen to learn anything he can.

We certainly didn’t go to shop [“She lies!”].


Tony amongst the yucca pups.

Even though we arrived a good hour before our appointed time (we were…excited), and even though a throng of 500+ salivating conference attendees were to besiege him and his staff the next day, owner Tony Avent very kindly made time to give Paul and me a personal tour of the back 40: where the real action is. Tony patiently answered our gazillion questions and filled our pockets with seeds. The propagation houses and trial areas have more amazing plants than you can shake a stick at. Many are one-of-kind hybrids or species. The vast Colocasia trials actually gave me goose bumps – alas, no photos were allowed. A walk through the display and trial gardens (Juniper Level Botanic Garden), resulted in several trips back through the retail houses to find that OMG! plant we just saw. We topped our visit off with the purchase of way too many yummy plants. Delightful, indeed!


The trial and breeding collection of Epimedium species and hybrids. Who knew there were that many???


North Carolina or Hawaii?? That’s  Colocasia ‘Diamond Head’.


I’m in an Agave/Yucca phase and this isn’t helping a bit.


Paul demonstrates “The Joy of Plant Shopping”.

Fabulous Sporobolus!

“Where have you been all my life?!!”

Every once and a while, I come across a plant and simply fall in love.

I  am not alone on this particular species, and the bandwagon is getting mighty crowded.  Sporobolus heterolepis is the object of my affections…it even has an intriguing common name – Prairie Dropseed. It’s native to much of North America, short of the West Coast.  Though most widespread in the Midwest, there are isolated populations in Virginia, North Carolina, and Pennsylvania. It’s even hardy up in the Arctic North (where Jeff and Linda live).


Sporobolus  shows off some  fluffitude while Echinacea tennesseensis look on in amazement.  Author’s garden.

Now on to the juicy description: fine, green foliage forms fluffy mounds or tussocks up to one and a half feet tall and up to two feet wide.  I describe it to my students as “pet-able” – one just wants to run their fingers through the flowing locks… The tiny, fragrant  flowers appear in late summer form a fluffy cloud above the foliage and wave about on slender stems, even with the slightest breeze.  I think the flowers have a coriander scent, have also heard buttered popcorn and vanilla.  Seeds form and then drop to the ground around the plant (hence the common name), at which point the birds scarf them up.  There is very little actual germination; the species is in fact endangered or threatened in several states (USDA Plants Database).  As the weather cools, the fall color can range from bronze to orange to apricot – just gorgeous – and then turns to a tawny buff for the remainder of the winter.

Newly-planted in the Hahn Horticulture Garden at Viginia Tech – check out that fabulous fall color!

As with many prairie natives, this a very tough character once established – puts up with lousy soil,  little rainfall, and is definitely drought-tolerant. We’ve added more than 100 of them to our campus meadow garden.  At my favorite public garden, Chanticleer (Wayne, PA), they’re planted in huge drifts and are managed in the “natural” way, with controlled burns in the early spring.

Doubt you’d find it at a big box store, but it should be available at an independent garden center near you! Please note this one of those species that does NOT look very exciting in the pot, especially in the spring (green, grassy, that’s it).  But give it a season or two in your garden and…[cue romantic violins…].