Questions

A group of tall, column-shaped cacti from the Andes, grown as garden and container plants, growers say; unlike desert cacti they come from places with real rainfall and heavy dew, so they want more water than a typical cactus.

"San Pedro" is the common name for one species in the group, Trichocereus — what Trichocereus means pachanoi — what Pachanoi means, growers say; Peruvian Torch (peruvianus — what Peruvianus means), Bolivian Torch (bridgesii — what Bridgesii means) and scop (scopulicola) are close relatives with the same care needs, and the names are used loosely.

Fast for a cactus, but climate-dependent, growers say: about one to three feet a year in Southern California, 22, 20 and 17 inches in one season in Spain, and under half that pace for the same collection in northern Europe.

A clone — what Clone means is one original plant plus every piece ever cut from it. These cacti cannot pollinate themselves, so seed from a named plant never comes out the same and only a cut piece — what Cutting means copies exactly; that is why collectors trade named cuttings — usually a person, a street, a code or a nickname.

Probably not: a clone — what Clone means looks different in different conditions (full sun gives longer spines and yellower, blockier growth; shade gives slimmer, greener plants), growers report, and a clone name can drift, so the same name is not a guarantee of the same plant.

No, and no one else honestly: conditions and age change every feature used to identify these plants, so a photo is a pointer at best and real certainty needs flowers or DNA. I won't name a plant from a photo, and every name here is the label it came with.

Photograph it in the box first — that is what every seller's claim window needs, sellers and growers say. Then take it out; a cutting — what Cutting means should not sit sealed in cardboard longer than it must. Check the cut face is hard, dry and shiny. If it is, pot it today in dry mix, one to two inches deep, and do not water it yet; keep it in bright shade for the first few days. If the face is soft or damp, stand it upright in the shade until it hardens, then pot it.

Either way it arrives with a hard, dry face: an already-callused cutting — what Cutting means has already had the week or two of drying between cutting and shipping, and a cut-to-order one is held the same week or two to dry before it ships. Growers say if the face is ever soft or damp, stand it in the shade until it hardens, then pot it. Humid air and thick pieces take longer.

One to two inches — just enough to hold it up; depth is the single biggest cause of a rotted — what Rot means cutting — what Cutting means, because the green flesh below the soil line is the vulnerable part. If it is tall, stake it rather than burying it deeper.

Not at planting. About a week later a splash (just enough to darken the top inch of the mix), then another sip a week after; only once roots have taken hold does it get a proper soak. Growers say the stricter schedule — nothing until roots show — works too; what fails is mixing the two.

Usually a few weeks to about two months, though it varies from days to several months; warmth and long days speed it up, cold and dark slow it down.

Don't dig it up — pulling a cutting — what Cutting means to check breaks the new roots, growers agree. Fattening ribs mean water is being absorbed and a fresh growing tip is another sign; if you must check, a gentle side-to-side wiggle near the top is the only permitted move — resistance means roots are gripping.

Almost certainly not — that is the normal sequence, growers say: a cutting — what Cutting means grows a little, then shrivels as it lives off stored water, and roots appear shortly after. Once it drinks, the column plumps back up; leave it dry until it wrinkles, then give it a little.

Probably not: vertical growth often stalls for months while the plant builds a root system — invisible progress, growers say. If it also gets no warmth or light, or the mix holds water, those are the three things to fix.

On a tip cutting the growing point goes up, growers say; on a mid cut — what Mid cut means, the little notch just above each areole — what Areole means (the felted spot the spines come from) looks like a seagull's wings, and wings up is the usual guide. Planted upside down, a mid cut never grows.

Bright, but not automatically maximum: all-day sun yellows them in hot, high-UV places, while full sun is often fine in milder climates, growers report. The rule is not how much but how fast — every increase in light has to be gradual; a week's jump from cloudy and 80°F to sunny and 95°F (35°C) is enough to burn them.

Water thoroughly, let it dry out, then water thoroughly again. Growers say in real heat you can water before it is bone dry; in cooler weather let it sit dry a few days first — roughly once a week in a hot, dry season. Do not leave it bone dry for weeks, and do not leave it soaking.

Look at the ribs: squeezed tight and sunken means the plant is running low, spread wide and flat means it is full, growers say. Cacti cannot droop, so rib compression is the signal, and wrinkling after several hot days means it needs water now.

Growers say something that drains fast: roughly two thirds gritty mineral material (pumice — what Pumice means, lava, perlite — what Perlite means) to one third organic — what Organic (in a soil mix) means. Richer mixes grow faster, but drainage is not negotiable. And skip one thing no matter what: do not put a layer of gravel in the bottom of the pot.

Anything with drainage holes and no attached saucer; pick one heavy and wide enough that the plant does not topple, and stake a tall column, growers say. Fill the soil to about half an inch below the rim — that gap is your watering reservoir. Avoid glazed pots with no hole; use a plastic liner if there is one.

It does not need feeding to stay alive. If you do feed a potted plant, feed about once a month while it is growing — from March to October at the longest, June to September at the shortest — and none in winter or straight after repotting.

Use an ordinary balanced feed at a quarter to half the label strength, and no single ratio is agreed. Water each feed through until it runs out of the bottom, which flushes salts, and stop in extreme heat as well as winter. Never put fertilizer near a freshly planted cutting — what Cutting means whose buried skin — what Epidermis means is still green.

Full-speed growth happens with daily highs between about 68 and 86°F (20 and 30°C); above about 95°F (35°C) growth slows and the plant wants shade, and it slows below about 60°F (16°C) and stops around 55°F (13°C).

It depends on your winter, and crucially on whether the soil is dry: kept dry, most survive nights down to about 25°F (−4°C) if it climbs back above freezing by sunrise, though tolerance varies.

A cold plant that is also wet is in real danger; a dry one usually is not.

If your winters are harder, overwinter it between about 35 and 55°F (2 and 13°C), dry, and stop watering.

Yes, but light is the hard part: a sunny window is not enough for a mature plant — aim for at least 750 PPFD — what PPFD means from a proper LED panel, with 1000–1250 much better. The other trap is heat without light, which makes thin, weak growth; keep air moving.

Press it. Soft means rot — what Rot means; hard means not rot. A hard dark patch, a black blister you cannot dent, or a healed — what Healed means white scar are all fine; soft, squishy, dark tissue needs cutting out with a sterilized knife until no discolored flesh remains. Rot below the soil line is the dangerous kind, growers say.

Most often too much sun, especially worst on the sunny side and raised ribs; cold weather colors the whole plant temporarily and reverses in spring.

If the yellowing runs evenly round the lower column, check the watering, the roots and the cold before feeding, growers say.

That is etiolation — what Etiolation means: on a rooted plant, not enough light; on an unrooted cutting — what Cutting means, the tip running ahead of what the plant can supply — nothing to do with light. The thin section stays a permanent weak spot, growers say; fix the cause first, then either live with the waist or cut the tip off and re-root or graft it.

Run the quick tests before you spray anything, growers say. Identify first: broad-spectrum spraying kills the predators and lets the real pest bounce back. Fast, non-webbing specks may be predator mites on your side; if damage keeps spreading, treat it as a pest. Wipes off with a damp cloth or toothbrush? Scale. Will not budge? Old scarring. Sticky white cotton-wool patches are mealybugs — what Mealybug means. Jumps when you blow on it? A harmless springtail — what Springtail means.

Growers say this is the one confusion worth taking seriously — maybe, and maybe not. Natural monstrose — what Monstrose means and crested — what Crested (cristate) means growth is prized, but witch's broom — what Witch's broom means looks similar and is a contagious, incurable infection spread by sap-sucking insects. The tell is a pup — what Pup means on a pup on a pup, with ribs vanishing and a lot of woolly fluff; pest damage to the tip can raise a similar harmless cluster, so isolate first, identify second.

Usually too much water at once: the inside swells faster than the skin — what Epidermis means can stretch, growers say. Leave it — splits heal into scars on their own and should not be cut; if it keeps happening, give less water at a time.

Sellers and growers say a tip has the growing point and carries on getting taller from it; a mid is a section from further down with no growing point, so it restarts by pushing new branches from its areoles — what Areole means, roots and grows just as well, and usually costs a little less. The only extra thing is to plant it the right way up.

For a tip cutting — what Cutting means, yes — thickness counts for more than raw length, growers say: a fatter piece carries more stored energy and is less likely to go thin and weak while it roots, and needs no long piece behind it. Short tips are cheaper to ship, which is why they are common.

Three things, in this order. Sellers say to read the length first: the community's unit is inches. Then the name, a claim about which plant the piece was cut from. Then the price line — a trailing "+" means postage on top, an auction figure is a starting bid, and a pack or lot covers an unknown number of plants.

It means the seller cuts the piece off the mother plant — what Mother plant means only after you order, so the drying happens after you pay — a good sign, since the plant was alive on the mother until your order came in. Thick cuts and humid weather take longer; you can cancel for a full refund any time before it ships.

You can, and it is worth knowing what carries the risk: cold plus wet is what damages a cutting — what Cutting means in transit (one grower reports cuttings damaged when the weather dropped from 40–50°F (4–10°C) to 5°F (−15°C) in the mail, and a freshly sealed cut takes it worse than an established plant). Orders paid from November 1 to March 31 get a heat pack — what Heat pack means in every box with a live plant, and each plant's price includes $5 for it; when plants share a box, you pay for one. It is already in the plant's price — nothing extra to buy. Frost damage on arrival is covered by the 48-hour guarantee: open the box the day it lands, photograph it, and claim on your order page within 48 hours of delivery.

Usually not: outdoor-grown plants carry old healed — what Healed means bug bites, sun marks, corking and small scuffs — the marks of a hardened-off plant — and they grow out over time. What is not normal is soft squishy tissue, fuzzy gray mold, or a cut face that is not hard and dry, growers say. Claim within 48 hours of delivery if something is really wrong — the window the Terms and the Returns page both give you.

Yes, for a few weeks: the most common way pests enter a collection is on a newly bought plant, with eggs hidden between the ribs and in the roots. Thrips — what Thrips means are the worst case — their eggs sit inside the plant tissue and their pupae in the soil, so a new plant can look clean under a magnifier and erupt a week later, growers say.

Yes, and cutting one usually gets you more plants, not fewer — a healthy column typically returns two or three new heads from a single cut.

• Sterilize the blade.
• Cut when the plant is healthy, hydrated and the weather is good.
• Angle the cut so it does not form a little bowl that holds water.
• Stand the piece on a rack in shade with air all round until the cut face is hard, dry and shiny — one to two weeks for an ordinary cutting — what Cutting means, longer when very humid.

Probably, given time and warmth: flowers come in spring through summer, open at nightfall and are gone within about a day. Growers say steady moisture carries buds through, since a dry spell while the plant is budded can make them drop. A plant that has flowered before will very likely flower again after cutting — what Cutting means and repotting, so an old flower scar is a good sign; some plants never bloom.

No: these cacti cannot fertilize themselves, and two cuttings — what Cutting means of the same clone — what Clone means are genetically the same plant, so however many you own they will never set seed with each other.

A whole fence line of one clone can flower for decades and never fruit; you need two different plants — two seedlings — what Seedling means, or two different clones.

Grafting joins a piece of one cactus onto the roots of another so the top grows faster and fatter than on its own roots. People do it for speed, to multiply a rare plant, to rescue a broken piece, and to keep variegated plants alive when they lack the green tissue to feed themselves, growers say.

You do not need to do it — most of these plants root well on their own; it is a technique, not a requirement.

Only if you enjoy the process: seed is much cheaper, but it needs near-daily attention for months, and the plants take roughly ten to fifteen years to flower — a year-old seedling — what Seedling means skips the slowest, riskiest year. And seed from a named plant will never give you that named plant, because these cacti cannot self-pollinate.