Spider plant propagation is one of the easiest jobs in the whole houseplant world. To propagate spiderettes, you snip a healthy plantlet off the long runner, then set it in water or moist soil until roots grow. Most plantlets root in one to two weeks. You do not need rooting hormone, special light, or any fancy gear. A glass of water on the sill or a small pot of damp mix does the job.
A cut spiderette sat limp and rootless in my water glass for three weeks while I checked it every couple of days. I set fresh water under it again and again. Still no roots showed at the base. Meanwhile a second plantlet, still joined to the Vittatum mother by the north kitchen window, hung over a nearby pot. I set that one into the soil with a bent paperclip and left it attached. It rooted in eight days and gripped the mix while the cut one in the glass still floated there, pale and stalled.
Both methods work for you, and the reason comes down to how the plantlets are built. Many spiderettes already carry small starter roots, those little white or gray nubs at the base. Those nubs let your water rooting take off fast once the tip touches liquid. Soil pinning works for a different reason. The baby stays connected to the mother, so it keeps drawing water and food from her until its own roots anchor. That steady supply is why an attached plantlet rarely stalls the way a cut one can. If your cut baby stalls in the glass, just press it into damp soil and give it a week.
Pick a healthy spiderette that already shows small nub roots at its base on the stem.
Set it in a glass of water until roots grow, or press it into moist potting mix to root.
For soil rooting, leave the baby joined to the mother until it anchors, then cut the stem.
Once roots reach an inch or two (3 to 5 cm), move the young plant into well-draining soil.
Before you can root anything, your mother plant has to make those spider plant babies in the first place. The plantlets form when the plant gets short days and long, dark nights. Research from NC State and Clemson points to nights of more than 12 hours of darkness for at least three weeks as the trigger. That is why most plants send out runners in fall, as the days shrink. If your plant sits by a lamp that stays on late at night, it may skip plantlets, since the broken darkness reads as a long day. Move it to a darker corner each evening and you give it the long nights it needs.
Once your roots reach about an inch or two (3 to 5 cm), move the young plant into a small pot of well-draining mix. A blend of standard potting soil with a handful of perlite drains fast and keeps your new roots from sitting wet. Pick a pot only a bit wider than the root ball. Too much soil holds too much water around those young roots, and that is the fastest way to rot a baby that was rooting fine for you.
One last tip that surprises people. Do not rush to upsize your mother plant after you harvest babies. A slightly root-bound spider plant makes more plantlets, not fewer, because the snug roots seem to push it toward making offsets. So leave her a touch crowded, keep your nights long and dark in fall, and your spider plant propagation will run on its own all year. Pot up your babies, gift a few to friends, and let your whole cycle start over again.
Read the full article: Spider Plants: Complete Care Guide
