How To Grow Plants In Water Without Soil
Growing plants in water is one of the simplest and most satisfying ways to enjoy greenery indoors. Whether you want to propagate cuttings or keep a permanent aquaponic-style display, plants can thrive without soil when you give them the right light, nutrients, oxygen, and care. I’ve been doing this on my kitchen windowsill for years—jars of pothos, vases of philodendron, even a few herbs—and I’ll walk you through everything I’ve learned so you can succeed too.
Why grow plants in water?
There’s something magical about watching roots unfurl in clear water. Growing without soil has real advantages:
- Clean and decorative—great for small apartments or offices
- Easy propagation—you can see root growth and intervene early
- Fewer pests and mess—no soil means fewer fungus gnats and cleaner surfaces
- Space-efficient—you can grow many cuttings in small containers
“A simple jar of water and a few cuttings can brighten a whole room. It’s low fuss, high joy.” — from my kitchen table
Which plants do best in water?
Not every plant will love being permanently water-grown, but many common houseplants and herbs do remarkably well:
- Pothos (Epipremnum aureum)
- Philodendron (various species)
- Spider plant (for baby plantlets)
- Lucky bamboo (Dracaena sanderiana)
- Peace lily (can be grown temporarily)
- Coleus cuttings
- Herbs like mint, basil, and oregano for short-term harvesting
- Tradescantia and many succulent cuttings (watch water needs)
Tip: Start with hardy vining plants like pothos and philodendron—they root quickly and tolerate water-only culture well.
Step-by-step: Propagating cuttings in water
This is the most common method and the one I use daily. It’s simple and reliable.
- Choose a healthy stem and cut 4–6 inches below a node (the knobby part where leaves or roots emerge).
- Remove the lower leaves so no foliage is submerged; leave a couple of leaves at the top.
- Place the cutting in a clean glass or jar of water so the nodes are submerged.
- Keep the jar in bright, indirect light—avoid hot direct sun that can scorch leaves and heat the water too much.
- Change the water weekly or when it looks cloudy. Rinse the jar and the cut end of the stem.
- Expect roots in 1–4 weeks depending on species and temperature.
Optional: Dip the cutting in rooting hormone before placing in water to speed rooting, especially for woody stems.
Simple hydroponic methods for more serious growers
If you want to keep plants permanently in a soil-free system, consider these approaches:
- Deep Water Culture (DWC): Roots dangle in oxygenated nutrient solution. Use an aquarium air pump and airstone to keep oxygen levels high.
- LECA / Semi-hydroponics: Lightweight expanded clay aggregate (LECA) supports the plant while a reservoir below supplies water and nutrients. Great for long-term houseplants.
- Bubbleponics: A proactive version of DWC where the water is bubbled to oxygenate and a pump circulates nutrients to roots.
I converted a few older potted philodendrons into LECA and they’ve never been happier—clean, tidy, and I only top up water every couple of weeks.
Feeding and water quality
Plants in water need nutrients that soil normally provides. Without them, leaves will yellow and growth will stall.
- Use a liquid houseplant fertilizer or hydroponic nutrient solution. Start at 1/4 to 1/2 the label strength to avoid burning roots.
- Top up nutrients weekly or add lightly with each water change. For DWC, maintain a regular dosing schedule.
- Water pH matters: aim for 5.5–6.5 for most houseplants. If a problem arises, test and adjust with pH up/down kits.
- Use filtered water when possible. Tap water that’s heavily chlorinated should sit out 24 hours to off-gas chlorine, or use filtered/RO water.
Light, temperature, and location
Light and warmth are essential. Give your water-grown plants bright, indirect light. South- or east-facing windows work well, but avoid harsh midday sun directly on glass, which can burn leaves and encourage algae.
- Temperature: 65–75°F (18–24°C) is ideal. Avoid cold drafts.
- Rotate your jars every week so growth remains even.
- Cover or use opaque containers for long-term culture to reduce algae on roots, or partially shade the root zone.
Common problems and solutions
Here are issues I see most often and how to fix them:
- Cloudy water and slimy roots: This is bacterial growth. Remove the cutting, trim rotten roots, wash container and stem, refill with fresh water and a little bleach rinse if needed. Re-root the cutting.
- Algae on roots: Move to a less sunny spot or use opaque containers. Clean roots gently if algae persists.
- Yellow leaves: Often a sign of nutrient deficiency—start a diluted nutrient schedule.
- Roots not forming: Try a new cutting lower on the stem, use rooting hormone, or increase warmth slightly.
Moving from water to soil (and back)
Some people want to start in water and then pot up. If you do, be gentle—roots formed in water can be more delicate.
- Gradually expose the roots to soil: pot in a airy mix and keep the soil moist but not waterlogged for a couple of weeks.
- Trim any very long, thin water roots a bit to encourage thicker root development in soil.
- Many plants stay happily in water years if you maintain nutrients and cleanliness, so stay flexible depending on your desire.
My favorite water setups and final tips
I love a mismatched collection of jars on the windowsill—short wide jars for philodendron, tall slender bottles for pothos, and a decorative ceramic vase with a hidden reservoir for my peace lily. A couple of practical tips from my experience:
- Label cuttings with the date, especially if you’re experimenting with different species.
- Keep a spare air pump on hand for DWC systems—oxygenation makes a huge difference.
- Don’t be afraid to start many cuttings at once; some will root faster than others.
Growing plants in water is nourishing for the gardener as much as it is for the plants. It’s simple, meditative, and endlessly rewarding. Try a few cuttings this weekend—you’ll be surprised how quickly life appears in a jar.
