Start hydroponics with one lettuce plant

What you need to know

Covered reservoir and net cup

Borrow an opaque, food-safe 8–10-litre vessel with a matching pre-cut lid and net cup. Never reuse a chemical container.

One rooted lettuce seedling

Choose a healthy seedling rooted through a hydroponic plug; add clean support medium if needed.

Water, nutrients and measure

Use potable tap water, complete hydroponic feed for leafy crops, and a measuring jug.

pH check

Have strips covering pH 5.5–6 or a suitable meter, plus labelled adjustment or supplier help.

Suitable grow light

Borrow a lamp and timer, with its recommended plant distance, and keep electrical parts away from water.

Plant one rooted lettuce seedling in a covered nutrient reservoir. This passive method has no pump, though an indoor lamp uses electricity. Allow 45–60 minutes; growth takes weeks. Price the seedling, feed and pH supplies first. US$50 is a spending cap with lamp and vessel borrowed, not a quoted setup price.

Mix and place the seedling

Choose a stable spot under the light. Wash and rinse the reservoir. Measure the potable water, then mix complete leafy-crop hydroponic nutrients at the label’s lettuce or noncirculating rate and in its mixing order. Do not substitute soil fertilizer or guess a dose. Keep concentrates away from children and pets. UF/IFAS Extension’s lettuce guide shows placement and nutrient preparation; its outdoor season applies to Florida.

Test the mixed solution; the UF method targets pH 5.5–6. Outside that range, follow a labelled hydroponic pH product or ask a supplier for help. Avoid household adjustments. Set the initial level to immerse roughly the bottom 2–3 cm of the net cup. Support the rooted plug without burying leaves. During setup, moisten a dry plug and adjust the initial level until roots reach solution, then secure the lid. If you have only seeds, start them in a plug before transplanting.

Give the roots air as the level falls

Set the grow light for 12–14 hours daily at its maker’s plant distance. Keep water away from sockets and allow room airflow. A bright window alone may not grow a full head; University of Maryland Extension explains the light choice.

Record the date, variety, nutrient dose, pH and initial level. Check the plant and solution daily. As the level falls, space above the solution lets some roots take up air. Do not refill to the original line and submerge them. Kratky’s paper diagrams this change. Harvest a smaller lettuce before the reservoir runs dry, then clean the equipment for another plant.