A Color Burst

It was a lazy Saturday morning and I was in sloth mode.  I hadn't even taken my usual walk around the 3-mile neighborhood loop.  If you've ever seen the sloths of Central America, you know that their favorite 'activity' is just hanging out, usually sleeping.  To quote National Geographic, "The sloth is the world's slowest mammal, so sedentary that algae grows on its furry coat."  Rather than in a tree, I had perched myself in a comfy chair on the patio to enjoy the glorious, but all-too-brief show of the trichocereus cactus blooms in the garden.  Big puffy clouds kept the sun at bay and the temperature in the quite pleasant range. 

 

Trichocereus, also known as hybrid torch cacti, are popular with gardeners in Tucson for their huge, brilliant blooms.  Hybridized from tropical species, they are fairly cold tolerant, asking only for a bit of filtered shade and an occasional splash of water.  I have a collection of perhaps twenty plants in my Jardín Cactita, the little cactus garden.  A paltry number compared to the Desert Museum's large collection.

 

 



 

Cactus bees come to gather the abundant pollen and nectar, and pollinated plants will produce large, round fruits filled with tiny seeds. Being hybrids, it's doubtful that the seeds are viable, but I should ask a knowledgeable grower about this.  I might try growing some new plants from seed.

 

 

 For the most part, the blossoms only last one day, closing up by late afternoon, never to open again.  A couple of the species, however, produce flowers that will open for a second day.  Thus, it's important to take advantage of the event, drop what you had planned and simply enjoy!

 

 



 

 

 

 

 

Flower anatomy is primarily what determines the taxonomy of plants.  While it might seem obvious from looking at a plant that it is a cactus, that's not necessarily so.  Many non-cactus plants, for example, have spiny, sharp projections.  People often mistake some euphorbias, agaves and ocotillos for cactus.  Cactus flowers have a multi-lobed stigma (the white, or cream, structure in the center of the photos, the female part) and many stamens (the male, pollen-carrying structures deeper in the center). 

So, I was sipping my coffee, taking photos, enjoying the flowers and watching the hummingbirds zip around.  My year-around hummers are Costa's and Anna's and I am so accustomed to the sounds they make. 

 

 

So, when a new sound entered my consciousness, I looked quickly around to see one of the Anna's being chased by .  .  . a rufous??  Wow, what a surprise!  There was no doubt - the lovely rust-colored wings, the orange-red iridescent throat, and that famous rufous aggressiveness.  Even with my camera in my hand, I was too dumbstruck to take a photo.  Not that he would have slowed down long enough anyway.  The birding experts say the male rufous migrate early, but THIS early?  Oh, that was exciting.  The rufous made a couple more speedy passes by the feeder but never stopped to drink.

 

No sooner had I calmed down than another hummingbird flew right by my face and it was a blur of color that only registered as blue.  Blue?  Sure enough, a few moments later a better view revealed the red beak and the brilliant colors of a male broad-billed.  What a crazy day!  Flying flowers competing with the torches. 

 

A desert spiny lizard came out and posed with the flowers. 



Some Gambel's quail stopped by the snack bar.

 

 

And those flowers just kept on blooming.

 



Maybe every day should be a sloth day!  I won't get nervous until I start to see the algae grow.

The End Is Near

No, I'm not predicting the end of the world, or even my own demise, but rather that of some of my plant friends who have grown up and lived in my yard for longer than I have.  Life and Death are more closely connected than we think, especially in the case of agaves, whose dying mission is to reproduce themselves.  Sort of like salmon going upstream to spawn, one last mega-effort to lay eggs, and then to die.  Agaves, those succulent plants in the family Agavaceae, expend their last energy resources to send up a giant bloom stalk, flower and scatter its seeds to the wind, after which death will slowly come to the entire plant.

Bloom stalk emerging from Agave americana

I have many agaves in my yard, both large and small, of perhaps 12 different species.  The lifespan depends on the species and may vary from 7 to 40 years.  The man who founded our neighborhood in the late 1940's loved the big Agave americana (also misnamed 'century plant') so much that he named a street for it, and I'm lucky enough to live on Agave Drive. These wonderful landscape plants offer low maintenance, low water requirements and interesting sculptural forms, colors and textures.  Many species will also provide an endless supply of young 'pups', or offsets, which are clones of the parent plant.  The fleshy leaves grow in a rosette around a central spine, and are curved to channel water to the base.

But back to my friend, the big agave whose bloom stalk I noticed just the other day.  This huge stalk, looking for all the world like an asparagus spear on steroids, will grow at an amazing rate, eventually reaching 30' or more.  Small branches will emerge from the main stalk, bearing multiple buds that will open into bright yellow flowers.  Bees, bats, woodpeckers and many others will seek out the sweet nectar.  The blooms of the agaves are of particular importance to some species of nectar-feeding bats who rely on the sugar source for their migration energy.

Native only to the Americas, agaves have been grown in this valley and Mexico for thousands of years by native peoples who prized the many gifts the agave had to offer.  Most of you are familiar with the  famous agave product - tequila.  A drink distilled from the juices of the heart, the name tequila can only be used to refer to the product of the blue agave, and which is made in the state of Jalisco (and a few surrounding areas) in Mexico.  Made with any other agave, or in a different area, and the drink must be called mezcal.  A type of fermented 'beer' can also be produced and is called pulque.

But, in addition to the liquor, agaves have much more to offer.  The dried leaves are separated into fibers and used to make rope, brooms, baskets and other woven products.  The heart, similar to that of an artichoke, can be roasted and eaten, or the juice extracted to make agave nectar (miel).  Today agave nectar is commercially available and is used as a syrup or honey substitute.  The spent, dried bloom stalks are sturdy and used for constructing ramadas or other structures.

Medicinal uses, too, are important.  According to Mark Dimmit of the Arizona Sonora Desert Museum, "The complex chemicals in this family have many uses. Compresses for wounds have been made from macerated agave pulp, and juices from leaves and roots were used in tonics. But beware-sap from many agaves can cause severe dermatitis. The juice of the more virulent agaves has been used as fish poison and arrow poison. Agaves and yuccas are used in Mexico to make soap.  More recently steroid drugs have been synthesized from extracts of several species in the family."

Bloom types fall into two categories - an unbranched spike (spicate) or branched (paniculate).  Some of the spicate produce small plantlets (clones) along the stalk that can be removed and planted.  At the moment, I have some of each type preparing to bloom in my yard.

Some of the Desert Museum's many agave specimens are also sending up the big shoots, including this one,

and will soon be in full bloom.

Here is a sampling of my various agaves

Don't confuse agaves with aloes.  Although similar in appearance, aloes are native to Africa and not related to agaves.  Aloes may bloom many times in their lifetime rather than dying after just one bloom.  

I leave you with two more species, Queen Victoria, and octopus agave.

Queen Victoria

Octopus

The Queen Victoria is a small, slow-growing, very symmetrical plant, while the octopus grows rapidly in something of a free-form.  Part of the octopus agave's attraction, especially to gardeners, is the lack of barbs along the leaf margins or at the point.

Happy Spring, and happy gardening!