If you’re accustomed to spring bulbs or even just garden gnomes, the desert operates on a different time-keeping system: one whose clock seems broken, as in moving on. Understand, then, what drives a creature that literaly uses sunshine for money and water like a bonus it never gets. How does such a thing live?
Above, a breakdown of its lifetime, from seed barely big enough to see without magnification to becoming an architectural giant: Look first at the early part of the equation. Really: From the time it germinates, the plant spend more energy underground than above, developing roots and also staving off death beneath the protective canopy of other plants called nurse plants. That’s not lazy; it’s a survival tactic.
How to Grow a Saguaro Cactus
And then take note of that first year: a fraction of an inch, less than half a pencil wide, according to the chart, and for the first decade, the plant is essentially invisible. If you measure your cactus with ruler in month two, you may well assume it has died, but no, it hasn’t, and it is laying a foundation to hold up fifty feet by the next century.
The story’s also about time: Most people do this wrong, wanting instant vertical growth, transplanting too early (or watering too much) because they think lack of height = lack of life. The numbers say otherwise: In seedling mode, the energy budget is dominated by root development, seventy percent of the plant’s effort go underground! The stem gets the scraps. So the script gets flipped on conventional garden wisdom. This is not a stem you’re growing; this is a sponge. If you yank it out to inspect, you undo all the work.
Around year twenty marks the end of nursery stage and the beginning of when the stem begin to really push upward with some real confidence. Age thirty-five is when flowers first appear. This is a huge psychological moment for the grower. It signals the plant has finally achieved sexual maturity and can reproduce. But there is even more to see.
Once those arms get going, as the infographic demonstrates, all bets are off. Most of it goes to main stem at first; the life of a juvenile cactus, but then, sometime between fifties and sixties, the arms begins their demand for attention. And this is where things go from finger-like to statue-like; here is where a third of your energy budget, says the chart, might be devoted to building arms. This is a major shift, and it explains why some saguaro is asymmetrical (or even downright lopsided). They aren’t failing any kind of generic test, they’re responding to their own unique microclimate.
Drainage is no negotiation, there are hard rules about caring for these giants, even if they’re in a pot. The plants do not want soggy soil, as wet soil kills the roots faster than a drought does, because the desert is dry for a reason. The desert has evolved plants that do not live in standing water, but instead store it. So resist watering every day. The instinct to water daily are an anxiety-based common mistake, don’t try to hurry a process that’s meant to be slow.
The chart above shows how many inches of growth occur at each stage of a plant’s life (and saves you the guessing part). As you can see, the rate of gain doesn’t spike as it grows into a giant… It just adds inches per year at a steady rate, because that consistency is a feature, not a bug, and it lets the plant build itself a strong internal structure that can hold up to heavy rain or wind.
Invest in Saguaro for the long haul. Treat the saguaro like an investment. Think of those early years as deposits that yield no visible return. The compounding phase happen in the middle. You get a payout in the later years. Compound interest could of not be rushed. All you can do is guard against it. Use water sparingly and let the sun do all the work.
And realize this might never result in an arm for you…in your lifetime. So what? That’s part of the fun. It is part of its care, and that is the joy. It is caring for something far older than you will ever live to know, which outlives you by decades. The silent years are the sweetest, the ones when the roots grab ahold. When they do, the rest falls into place. It goes from button to peg to column to landmark.