Hydroponics in an RV or Tiny Home: A Practical Guide
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Small spaces are where hydroponics really shines. When you do not have a yard, or your "yard" changes every few weeks, growing in water lets you keep fresh greens close at hand. But RVs and tiny homes come with their own quirks: tight floor space, temperature swings, limited power, and in an RV, the road itself. Here is how to plan around them.
Pick a passive system first
The Kratky method, developed at the University of Hawaii, uses no pumps and no electricity. For off-grid living, boondocking, or anyone watching their battery bank, that is a big plus. A few mason jars or a small tote can produce lettuce and herbs with zero power draw if you have decent natural light.
If you want DWC for bigger plants, a small aquarium air pump uses very little power, but check its rating against your setup before you count on it. Off-grid friendly is the goal.
Plan for movement
In an RV, water sloshes. A full jar on a counter becomes a mess on the first sharp turn. Some ideas:
- Use containers with secure lids and snug net pots.
- Travel with lower water levels, or move small jars into a sink or a bin while driving.
- Wedge containers in a cabinet, a milk crate, or a non-slip shelf liner.
- Choose small, separate jars instead of one large reservoir that can slosh a lot of water.
- Avoid glass in high-bounce spots; opaque plastic jars or totes are lighter and safer.
In Kratky, remember that the air gap between the lid and the water matters for the roots. If water sloshes up onto the air roots now and then, it is usually fine, but do not refill the container to the top just to keep it from sloshing.
Handle temperature swings
RVs, tiny homes, and mobile homes can heat up quickly, especially when parked in the sun. UF/IFAS recommends nutrient solution between about 65°F and 80°F for lettuce. Small containers change temperature fast, so:
- Keep reservoirs away from windows that get afternoon sun.
- Keep them low; floors are often cooler than counters and lofts.
- Use a little more water per plant to buffer swings.
- Wrap containers with a dark layer to block light and a reflective layer to block heat.
My full list of cooling ideas is in keeping reservoirs cool in a Texas summer.
Make the most of light
Windows in an RV or tiny home are often small or shaded by awnings. Leafy greens need bright light. If the plants stretch, add a small LED light. Look for a low-wattage strip or shop light you can mount under a cabinet or on a shelf. For tips, see choosing grow lights on a budget.
Space-saving layouts
- A row of jars along a window ledge with a lip to keep them in place
- A tote on the floor under a window
- A wall-mounted shelf with a light underneath
- A small DWC bucket in a corner for basil
Think vertically. A narrow shelf with a light on each level fits more plants in less floor space.
Water quality on the road
Campground and park water can vary a lot from place to place. Some is hard; some has been treated differently. Test your water with a pH kit when you fill up. If it is very different from your usual source, consider filtered or distilled water for small jars. See pH and EC/PPM explained for the basics.
Mixing nutrients in a small kitchen
Keep nutrient bottles sealed and stored upright in a bin. Mix in a dedicated jug, not your drinking water container. Label everything. Concentrated nutrients and pH adjusters should be stored out of reach of kids and pets, and always follow the label.
Best crops for small mobile spaces
- Loose-leaf lettuce, harvested a few leaves at a time
- Green onions, which stay compact
- Basil, especially in warm months
- Bok choy and other small Asian greens
- Herbs like chives and mint
For more on each, read 5 easiest crops for first-timers.
Mobile homes and manufactured homes
Many of the same ideas apply. Mobile homes can heat up in summer, so placement and insulation matter. On the plus side, you usually have more stable power and space for a small DWC setup or even a short NFT channel.
Start small
The best RV or tiny home system is the one you will actually keep up with on the road. Start with a jar or two. Check out the gear I use on my Gear page, grab the free mini-guide on the home page, or read the full book, The Soil-Free Farming Revolution, for more small-space setups.