The giant woolly morning-glory has gotten its bearings. I don't set out plants of this immense annual until the weather is truly warm and steady in June, but even so by early August they have climbed the twenty feet of my giant tripod.
It doesn’t bloom until its second year—which means that it doesn’t bloom at all for me here in New England. So it’s all about the ascent, the getting up there, the climb. Which for a morning glory means a twine.  Around and around, in a snake-spiral from bottom to top.

I plant four pots of Giant Woolly in the huge terra-cotta. So I have eight plants total: they come two in a pot. Stay tuned for why, but it’s a statistically-significant group. Their first goal is to find something to climb on. The young vines grow so quickly that they were already nearly a yard tall when I bought them. And they are so thick-stemmed even as youngsters that they completely ignore the string or the pea stake a “normal” morning glory would wrap itself around by tomorrow. Giant Woolly’s are holding out for bigger prey—taller prey actually—and that means thicker prey. The twenty-foot lengths of galvanized pipe that form the tripod are evidently to their liking—they race right up it in about six weeks. But it takes a few days to, so to speak, lead the horse to water. Vines have a sense of touch: They can feel when they are in contact with a likely support, and they seal the deal by spiraling themselves around and around it. On the way up, they feel every inch. All of that waving-around-in-the-breeze stuff, trying this direction then that, disappears after the host is detected and then selected. The tip of the vine now noses right around and around and around the host—in this case the galvanized pipe—with python affection. (Twiners characteristically twine in a spiral that's a bit smaller than the diameter of the host, ensuring a tight fit and minimal slippage.)
But Giant Woolly's are a bit slow on the uptake, so to speak. It isn’t enough for young vine to brush up against or even lean on the pipe at a spot midway down the stem. The sense of touch seems to localize much more toward the tip. So I tie each stem to the pipe loosely with twine every foot or so, right up to the fragile tip.
The tip of this one, which was held closely to the pipe then, has grown six inches more since, and is gratefully hugging the pipe. It was time to set this vine free.
But how do the tips know which way to go? What is it about that steady contact, in this case with the pipe, that helps them "decide"? Does that period of steady contact let the tips, who knows?, take readings from the stars? Track the sun's East-to-West path across the sky for a few days? Sense the lines of magnetic force heading up to the poles? Or is it because the biggest spiral of all—DNA—is, oh yes, all counterclockwise spirals too? However they do it, they determine right from left. Truly: right from left. And then they begin to twine as fast as the available heat and sun and water will allow, and only to the right. (Well, upwards and to the right. But never up and to the left.)
Self-clinging vines, ivy, say, don’t need to know their right from their left. They only need to know up. And then they grow up. Straight up. (They need to know front from back, though, growing their hold-fast roots only out of the front side, the belly of the stem that’s right against the wall or the tree or the house.) Twining vines need to be smarter. It would waste time to switch from clockwise to counterclockwise, to grow right-to-left one week, then left-to-right the next. And besides, maybe in the switchover you’d lose hold—lose your twine, so to speak.
Do other twining vines all grow counterclockwise? Are there vines that are ambidextrous, one plant choosing clockwise, one choosing counterclockwise? What a big life choice: This way? That way? It would be like coming out, and just as full of agony and honesty: I’m clockwise, world, and there’s nothing I can do about it but be proud and happy.
Or is it a North / South Hemisphere thing, like water down the drain: One direction in New York, the opposite in Rio? (Damn, the one time I was in South America, did I think to look? Nope, says The Washington Post: Most vines twine counterclockwise, as indeed do my Giant Woolly's. I have a variety of twiners (you’re not surprised, I hope, on any level?) Honeysuckles, hops, wisterias. I’ll survey the troops and report back.