kw: see list at the end
Consider what these creatures might be:
They "live within their own universe...a universe that is both dazzling and complicated. Its existence is within a different time scale than ours, visible only on close inspection by those interested enough to look. [They] live their lives just as we do, surrounded by loved ones, competitors, and enemies, seeking to find harmony and health; and hoping to leave behind a legacy of well-adjusted progeny capable of carrying on after their demise."
Consider a time scale between 100 and 10,000 times slower than ours. Depending on species, "they" may reach maturity in a year or less, as many familiar animals do, or it may take many centuries. Communication is nearly always soundless, and it is slow. To converse with one would entail waiting hours to days between, "How are you?" and "I can't complain." For most, communication is chemical, via air-wafted molecules or waterborne ones. Each "word" is synthesized on-the-spot.
We are used to animals, including ourselves, that move at the speed of gravity, or a little faster at times. To reach out, or to throw something, is done in fractions of a second. "They" make motions that take hours to months to complete. Usually: some can grasp or throw even more quickly than we can, under the right conditions*. But usually not.
What are "they"? Plants. A central theme of the textbook for gardeners, The Nature of Plants: An Introduction to How Plants Work by Craig N. Huegel, is that plants are as complex as animals, and do nearly everything animals do except move from place to place (usually!), but on slower time scales (usually!!), and typically in different ways.
The Nature of Plants is not a book of stories, it is a compendium of facts, ranged in subjects from Light, Water and Soil to Reproduction, Hormones and Communication. The quote in the first paragraph above is from the Conclusion.
The book has one tremendous lack: a Glossary. One needs a good memory to read more than a page or two into the book, because one will learn new botanical and chemical terms on nearly every page. Perhaps you are familiar with xylem and phloem, the fluid-bearing tissues that, respectively, bring water (and its contents) from the roots, and transport "processed water" throughout the plant to supply sugar and nutrients. It's less likely that most folks know what is a prothallus (the sexual generation of a fern; the fronded plants we see are asexual), or the cell types parenchyma, collenchyma and sclerenchyma that make up all the tissues of plants. Then the parts of a flower: receptacle, sepals, petals (the flower's "clothing"), stigma, style, ovary, ovules (female parts), stamen, anther, and filament (male parts). Those aren't too bad, but then for ferns (the asexual spore-bearing generation), analogous parts are indusia, sporangia and sori. And on and on it goes. I felt lucky that I studied botany early in my college years; still I learned several new terms. If you intend to keep the book, take notes: Make your own index of terms and concepts you want to remember; the book's index is sketchy.
As I said, this is a book for gardeners, written as a textbook to make us aware of all the needs a plant has. For example: When buying a shrub or tree for your yard, do you know how to check if it is root bound? If the roots are growing in spirals, around and around the pot, and you plant it in the ground without doing a little spreading and even root pruning (carefully!), then as the plant grows and the roots increase in diameter, that clot of spiraling roots will become a roadblock to growth beyond a few years. Perhaps that is okay if you got a dwarf tree in the first place, but it will be less healthy than a dwarf tree that didn't spend very long in the pot before being planted out.
Do plants think? There is some research that indicates they do have something similar to nerve impulses, even electrical communication within (an electric signal is used in the leaf of the Venus flytrap, for example). Some scientists think the roots are the "brain". If we learn to communicate with them (very slowly), perhaps they will tell us.
To repeat: plants do everything we do except move about the landscape. I read in a different book, years ago, that a shrub or tree is analogous to a colony of tiny animals, with the growing tips of the twigs being the "animals". Over time, the growing, branching tips gain genetic differences, similar to the way successive generations of animals are genetically different from their ancestors. There are also some vining plants that do move slowly about, by growing into new territory, and rooting periodically, and when the oldest roots die the plant has actually moved to a new place. Over long spans of time, the vine can migrate surprisingly long distances. But these are not mentioned in this book, which is for gardeners. We have trouble enough with English ivy and Virginia creeper and even Kudzu; they may not abandon old roots, but any of them can fill a yard if we let them, as can Wisteria (There is a Wisteria plant in Sierra Madre, California that has destroyed the house it grew all over, and covers the entire one-acre building lot).
This book is worth reading through once, and then keeping on hand to look up helpful things. It deals in principles, not in advice about specific plants. With that in mind, it's worth having.
*The Venus flytrap has leaves that can close on a small insect in a tenth of a second. A number of plants have seed pods that build up tension as they dry, and then erupt to throw the seeds several feet away from the parent plant. The leaves of the Sensitive Mimosa close in less than a second after being touched.
kw: book reviews, botany, gardening
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