The “Jar of Water” Trick: How to Multiply Your Spider Plants & Grow an Indoor Jungle for Free

Ever wish you could fill your entire house with lush, air-purifying greenery without spending a dime? With the spider plant, you can! These “gift that keeps on giving” plants are famous for their ability to produce dozens of babies, and water propagation is the simplest way to turn one plant into a jungle.

Spider plants (Chlorophytum comosum) are the ultimate beginner-friendly houseplant. Once a mother plant matures, she sends out long, arching stems—often called “umbilical cords”—that produce tiny miniature versions of herself known as “spiderettes” or “pups.” While you can pin these babies directly into soil, propagating them in water is more satisfying, allows you to watch the roots grow, and has a nearly 100% success rate.

Here is the step-by-step guide to multiplying your spider plants using only a glass of water and a pair of scissors.

1. Spot the “Spiderettes”

Before you start snipping, look for the small plantlets hanging from the mother plant. For the best chance of success, choose babies that have already started to develop tiny “nubs” or small brown bumps at the bottom. These are “adventitious roots” just waiting for a drink of water to start growing.

2. The Clean Snip

Using a clean pair of scissors or garden snips, cut the small plantlet away from the long runner. You can cut the runner close to the baby plant. Don’t worry about the mother plant; she will continue to produce more babies as long as she is healthy and getting enough light.

3. The Water Setup

Find a small glass, jar, or even a test tube. The key is to find a vessel that supports the leaves while allowing the bottom of the plant to stay submerged.

• The Secret: Only the bottom of the spiderette (where the root nubs are) should touch the water. If the leaves stay submerged, they will likely rot.

4. Location, Location, Location

Place your propagation jar in a spot with bright, indirect light. Avoid direct, harsh sunlight, which can heat the water too much and “cook” the delicate new roots. A north or east-facing windowsill is usually perfect.

5. The Maintenance Phase

Change the water every 2–3 days. Fresh water provides the oxygen necessary for root development and prevents the growth of algae or bacteria that can stunt the plant’s progress.

6. The “Root Rule” for Transplanting

Within 7 to 14 days, you should see white roots shooting out from the base.

• When to move to soil: Wait until the roots are at least 1 to 2 inches long. If you move them to soil too early, the roots won’t be strong enough to support the plant. If you wait too long, the plant may struggle to adjust from water to soil.

3 Pro-Tips for “Infinite” Spider Plants

1. Use Filtered Water: Spider plants are sensitive to fluoride and chlorine found in tap water, which can cause the tips of the leaves to turn brown. If possible, use rainwater or filtered water for your propagation.
2. Don’t Over-Pot: When you finally move your rooted baby to soil, use a small pot (about 3–4 inches). If the pot is too large, the soil stays wet for too long, which can lead to root rot before the plant is established.
3. The “Tug” Test: After planting your baby in soil, give it a very gentle tug after a week. If you feel resistance, it means the roots have successfully gripped the soil!

Water propagation is a fun, visual way to expand your plant collection or grow handmade gifts for friends and family. It takes the guesswork out of gardening and lets you see the magic of growth happen right before your eyes.