Tidying the desert plant display room

There are many recognized types of biomes on earth, scientists disagree on the number, but some estimate up to eleven different types. Displayed at the U of Minnesota Conservatory greenhouse are four different biomes selected for their diversity of plant life: antarctic forest, diverse desert, mediterranean scrubland, and ancient rainforest. Today, Coordinator A.. asked me to help clean the beds in the Diverse Deserts display. This room is open to the general public, and it gets quite a bit of traffic compared the to collection side of the greenhouse which is not open to the general public without appointment or supervision.

The Diverse Desert Room, D4, has four large beds filled with desert plants. The ground cover between the plants is made of granite pebbles. As time passes, leaves and other detritus from the plants fall to the ground cover, gradually coating the surfaces with debris. Today was the day to get down on hands and knees and clean out the debris from the granite pebbles. I used a small hand-broom to gently lift and sweep the debris onto the concrete path winding through the beds. Also, some of the smaller tree shrubs have grown to the point they need support to lift them up off the ground of the beds. We used twine ties and stretchy garden tape to tie branches to the fence railing which separates the display area from the collection side of the desert room.

For example, two of the larger shrubs are Plectranthus igniarius and Adenia venenata. Plectranthus igniarius is from tropical Africa, it is popular for its colorful flower spike (similar to that of coleus flowers). Adenia venenata has deeply lobed leaves on long green vines. White flowers in the spring are fragrant, with a sweet vanilla-like scent.

Comments

A Sensitive Plant and Common Weed

Mimosa pudica, also commonly called the sensitive plant was a popular houseplant when I was growing up in the 1970s. It was popular for its ability to quicky change shape by folding up its leaves to protect them from herbivore predators. At the slightest touch the plant is able to expell water from special cells in the leaves, changing the shape from frond-like to a stick-form. The plant creeps along the ground, never for than a foot or so in height. In tropical parts of the world this plant is considered and invasive weed. Today, as I was treating plants to remove pests I happened to touch the leaves of a Mimosa pudica , one with a pretty puff-like flower. Sure enough, the leaves all folded up to almost nothing. Mimosa pudica , the sensitive plant Other more routine chores during my four-hour shift at the U of M Conservatory included cleaning three plants of Hibiscus clayi, native to Hawaii. These three plants in particular have suffered repeated infestations with a variety of in...

Bog Monsters

As a layman of botany the idea of carnivorous plants has perplexed me. The capturing and eating of other creatures seems like it ought to be limited to animals, since animals are mobile and plants are not. Almost all plants survive and thrive in the world through photosynthesis. They do not need to feed on animals to survive. But, what about the group of plants that are carnivorous? As stationary plants, why and how do they eat critters? This topic was stimulated by my assignment today at the Conservatory Greenhouse of the University of Minnesota. My task was to clean several large tanks of water filled with aquatic plants. While cleaning the tanks I realized many of the plants were classified as carnivorous . What is it about the aquatic environment that causes plants to eat - in effect - other creatures? The short answer is carnivorous plants evolved in nutrient-poor settings such as pond water which is naturally low in the amount of nitrogen needed to synthesize proteins. To compens...

Autumn Inside the Greenhouse

I felt the firm grip of fall as I walked the half-mile from the parking lot to the Conservatory Greenhouse at the University of Minnesota, where I volunteer. The temperature outside was in the 30s, and the wind whipped at my face. Yesterday there had been snow flurries. In stark contrast to the outside world, the greenhouse climate was quite different. Part of the greenhouse is maintained at near-tropical temperatures. But other sections of the greenhouse are kept significantly cooler to support plants that have evolved in seasonal climates. Although indoors, autumn has arrived here too. The sunlight dims, and the nights grow long. Inside these cool greenhouse rooms the plants shed their leaves and virtually cease growth for the winter months, just as they would outdoors. Part of my assignment for today included the pruning of yellowing and brown leaves. Removing the dead foliage from the plants and the floors helps to reduce the overall risk of mold and other pests affectin...

City Gardener

Search This Blog