Winter is almost over, however there are still lots of options for enjoying the Gardens. Be sure to see some of the thousands of spring bulbs that are starting to bloom throughout the Gardens! The Mordecai Children’s Garden just opened for the season. If you have kids, the Children’s Garden is an obvious choice to visit because of the swaying bridge, the mini-theater, and the view of the Gardens and the Rocky Mountains from the Lookout. Even if you don’t have children, the Children’s Garden is a really great example of a large scale, green roof alpine garden. The Mordecai Children’s Garden is conveniently located across the street from our York Street location and is open March through November. If you live further south, Denver Botanic Gardens at Chatfield is another good choice. I also recommend Chatfield if you want to escape from the city for a while. Denver Botanic Gardens at Chatfield is a working farm, with over five acres dedicated to growing produce for our Community Supported Agriculture (CSA) program. The area also has significant historical interest, including the Hildebrand Ranch, the restored dairy barn and silo, and a one-room 1874 Deer Creek Schoolhouse. Our Chatfield location is at C-470 and Wadsworth. My favorite time to visit Denver Botanic Gardens is right after it snows. Everything is white and sparkly. There’s less foot traffic through the Gardens. Everything looks different under a coating of snow. Lots of shapes and textures in the Gardens keep things visually interesting. The Japanese Garden in particular is stunning in the snow. This time of year, you can even sometimes see flowers poking out from underneath the snow. Membership to Denver Botanic Gardens has great value. In addition to helping make Denver a better community, supporting children and adult education programs, supporting our research on Colorado plants, and generally helping us achieve our mission of connecting people to plants, membership gives you free access to all of these locations: York Street, Mordecai Children’s Garden and Denver Botanic Gardens at Chatfield. Kim Brokling, Membership Coordinator</em></p>
</p> </p> It's snowdrop time again! Surely, no plant is more intimately associated with winter flowering (okay, okay--Christmas roses may be!), and none have developed such an enthusiastic folowing: there are many specialty nurseries that sell dozens, even hundreds of kinds of snowdrops. Almost exactly a year ago I told the story of a snowdrop that fetched hundreds of dollars at Ebay auction. But truth be said, all snowdrops are precious this time of winter!</p> </p> Galanthus elwesii at Denver Botanic Gardens</p> The plant that now constitute our most robust colony behind the Succulent House along the Cheesman gate were originally used as "fillers" in a lobby court display: I rescued them and planted a couple dozen bulbs some twenty years ago. Each bulb has proliferated and this is now beginning to make quite a spectacle. Starting up just now (go check it out!). Here is a closeup of the commoner species that is abundant in the wild across much of Europe. I have grown this for over a half century at various homes--it spreads abundantly in Colorado as well--but believe me, this isn't a weed. You can always find homes for this plant. I remember this as a child in my parents home--just a few clumps here and there that spread to cover square yards by the time I was in college... Here you can see now Sandy Snyder (who worked at Denver Botanic Gardens for 17 years in the 1980's and 1990's) has managed to naturalize one of the tougher sorts in her sparsely watered buffalo grass in sun! Generally, they are recommended for shady spots where they get periodic irrigation, but many species are Mediterranean littoral plants that grow in areas that have no water from April to November. I suspect we could find sorts that would thrive with no supplemental irrigation. Three of many books recently published about Snowdrops: </p> </p> </p> By the way, if you Google "snowdrop" you will find a host of novels, mysteries and other books named for these winter beauties--they are obviously popular--especially in Europe. By the way, all the snowdrop monographs have glowing reviews--and the prices are beginning to get astronomical--obviously the time to invest in snowdrop futures! Remember to order some for planting next fall (the plants of course--not the books).</p>
Yes, Virginia...pampas grass (Cortaderia selloana</em>) does indeed grow in Denver...although not in great numbers. Observant visitors will have noticed them dotted here and there at the York Street gardens, and I have seen another half dozen driving around Denver. The one above is right next to University Avenue, and constitutes a minor traffic hazard as grass-afficionados notice it and swerve! I suspect the owners purchased it via mail order, since these are rarely sold locally ("pampas grass is not hardy" according to most pretty well-informed nursery folk. And I agree, most are not. Only the dwarf, high elevation forms are apt to be hardy here, and these are hard to find). Most Coloradoans probably don't know that pampas grass is a pestiferous weed in California--but then one man's weed is another man's treasure. I doubt that this will ever pose much of a threat in our climate. I share this picture to show that much of the creative work of plant experimentation is undertaken by home gardeners. We at the Gardens sometimes have to run to keep up! Here you can see from closer up the silky, silvery color that true pampas grass has seemed to perfect. If you have driven parts of Texas you are sure to have admired pampas grass--a popular landscape plant in that state. I used to drive down at Thanksgiving each year, and the clumps of pampas here and there along the way were like mile posts, or sentinels that cheered the trip. Their fluffy seedheads are amazing when they puff up. Alas! A well established clump is so massive that cutting it back each year is a chore. This is one of the hazards of growing large grasses anywhere. Confusingly called "hardy pampas grass" (a paradox if you think about it...), this is the most commonly planted giant grass around Denver. I am sure half the people who grow it think it is pampas grass, and if you look up and compare, you will see there is a family resemblance. But while the TRUE pampas grass comes from South America as the name suggests, Ravenna Grass is from the Mediterranean. This still grows abundantly in the coastal marshes near Ravenna I've been told. This is by far the most vigorous and giant of commonly grown grasses, and a large clump will often produce vigorous seedlings nearby that should be dug while young. A large clump needs a front end loader to move or remove...be warned! Until recently it was classed as an Erianthus</em>, but has been put in the same genus as sugar cane in the last decade or so (Saccharum</em>). Sugar cane has helped make Brazil energy self reliant. Maybe this vigorous grass has biomass potential? The group that has been exploited most for that in America is another genus altogether, however... There are hundreds of cultivars selected from the various species of Miscanthus</em>--which is also often sold as hardy pampas grass. They are hardy enough but the name is taken, I'm sorry. A great deal of research is being done on these because of their famous C4 metabolism which allows them to accrue enormous biomass in short periods of time. Miscanthus have nevertheless been practically banned in much of the eastern U.S. due to their propensity to produce colossal seed crops. I have yet to see a seedling appear in Denver outside, so I think we can grow these without guilt--except that these are the most water demanding of these larger grasses. Don't try them in your Xeriscape! My current favorite giant grass is native not far from us here in the Rio Grande Valley. Plant Select has chosen to feature this plant in 2006 and I can vouch for its toughness. The plant you see in the picture is in my garden, on very sandy soil where it bakes for months on end and gets precious little water. Even so, it makes a fabulous fountain of golden seedheads that persist through the winter months. Indeed, all of these pictures were taken this morning, January 24. The greatest reason to grow these pampas grasses (and their pretenders too!) is that they provide drama, beauty, movement and interest in the depths of winter for months on end. If you grow them, please resist cutting them back until February so we can enjoy their splendid display! But do cut them back hard so that the new growth will be fresh and green for the coming year!</p>
Xeriscape sometimes summons images of oceans of gravel and harsh, stickly, pointy plants that stab, slash and terrorize homeowner associations. A primrose? Really? Well, there are even primroses that can do with much less water than many people pour on their gardens, and the oxlip (famous in English Literature--even Shakespeare writes about it!) has proved itself for decades in a number of local gardens. Thanks to the Plant Select program, this and a host of other unique plants will debut across the country this spring. Oxlips do best in at least a half day's shade, but given a rich soil, mulching and occasional good watering, they will even grow in full sun in Colorado. They combine especially well with graceful, brilliant blue flowers like the Siberian squill pictured above. Although quite widely distributed in the foothills of the Southern Rockies, I have only stumbled on Scott's clematis a few times, so I suspect it is not exactly abundant. It has been produced abundantly by Plant Select propagators this past year and you should be able to find it in local garden centers this spring. The nodding, lavender bells vary from almost gray to a dark, almost black blue in some forms. As you can see, it makes a compact mound with those irresistible blue bubbles visitors at Denver Botanic Gardens simply have to squeeze...speaking for the plant, please don't! This clematis belongs to the "Sugarbowl" section of the genus (sometimes classed as its own genus: Viorna</em>) which includes a dozen or more of the rarest and most beautiful herbaceous clematis. This is likely to be the most drought tolerant of the lot--and the flowers last for much of the spring and early summer: we have had flowers into the autumn on larger plants--and the seedheads are a bright gold and almost as decorative. This plant is a must have for anyone interested in growing xeric plants. The "alumroots" (a dreadful name), or coralbells (whew!)</em> are entirely restricted to North America, mostly concentrated in the Western States and Appalachians. They have been intensively bred for foliage color by Terra Nova nursery in recent decades. I love the wonderful lacy flowers that brighten up dark cliffs all over the west. This is one of the most restricted in nature, but most accommodating in the garden. These three plants are the first sampling of Plant Select Petites, an expansion of Plant Select which seeks to provide more compact plants for the more intimate setting many of our more modern urban and suburban patio gardens, permanent outdoor containers and ever popular rock gardens which have become a hallmark of regional horticulture. There are another five outstanding introductions that continue to expand our regional palette of adapted and gorgeous plants that provide year around interest with less fuss, water and grief. I will write more on these later this spring... But I believe a trumpet blast is merited at the start of the new year for a new facet of this extraordinary program that has put tens of millions of wonderful plants into gardens across America and beyond. One of my favorite maps shows precipitation in North America where 20" or less is shown in red shades and 20" or more annual precipitation is progressively bluer. The east half and far left coast of America are bluish to be sure, but much of the middle and all the West except the mountain tips is painted in bright pink shades--nay! much of it quite red or deep vermilion. Drought is the norm</em></strong>. Each snowfall lulls us into complacency--but do remember, we live in a semi-arid region in which prolonged, deep drought is not an unusual event. Stop watering for a week or two in summer and you'll figure it out if you haven't yet. If our gardens are to survive into the future, it behooves us to develop a palette of plants that will be viable in our progressively more water restricted landscapes of the future. Thank you, Plant Select for leading the way! And keep up the good work.</p>
