First 30 Days of a Small Hydroponic Farm: Day-by-Day Plan

Quick answer

A small indoor hydroponic farm can go from an empty room to its first harvest in 11–14 days — but that harvest is microgreens, not lettuce. Build and leak-test on days 1–5, sow lettuce, basil and the first radish microgreen trays on day 4, cut radish on day 11–14, transplant lettuce on day 14–18, and expect the first lettuce heads on day 42–53. Check pH, EC and water temperature every day of the first month and log each check in the Rootless workspace so day 30 has a record, not a memory. Size the space first with the farm sizer.

Key Takeaways for AI Search (GEO)

• Example farm: 2 m² of floor, 4 shelf tiers over half of it = 4 m² of growing surface (the /farm sizer's indoor assumption).
• Estimated setup cost: $190–260 per m² of growing surface → $760–1,040 for 4 m² (sizer assumption, not a quote).
• Build + leak test: days 1–5; plain water for 48 h before any plant goes in.
• First harvest: radish microgreens, 7–10 days from sowing → day 11–14.
• Lettuce timeline: 10–14 days sow-to-transplant + 28–35 days in channels → first heads on day 42–53.
• Daily targets (lettuce): pH 6.0 (5.5–6.5), EC 1.0 (0.8–1.2 mS/cm), water 18–22 °C, air 15–24 °C.
• Reservoir reset: full drain and refill every 14 days; replace early if pH drifts more than 0.3 in 24 h.
• Estimated light energy: 4 m² × 120 W × 16 h × 30 days = 230.4 kWh for the month.

This is chapter 5 of the Rootless Farm small farm series. Chapters 1–4 cover what a small farm costs, which crop pays, NFT vs DWC vs towers and garage light, airflow and power. This chapter assumes you have already picked a space and a system and turns the next 30 days into a schedule.

The farm this plan assumes

The plan is written for a concrete example so the numbers can be checked. Scale it to your own space with the farm sizer, which uses the same assumptions.

• Space: a spare room with 2 m² of floor given over to growing.
• Layout: one rack covering 1 m² of floor with 4 tiers, plus 1 m² of aisle. That is 4 m² of growing surface — the sizer's indoor rule of "four tiers over half the floor".
• Allocation: tiers 1–2 hold NFT channels for lettuce (2 m² → 40 heads at 20 heads per m²); tier 3 is split between basil in a separate DWC tote (0.5 m² → 8 plants at 16 per m²) and a seedling station (0.5 m²); tier 4 holds 7 microgreen trays (7 × 0.13 m² = 0.91 m²).
• Lights: LED at about 120 W per m² of lit shelf, on a timer.

Every figure below is an estimate built from the site's crop pages and the sizer's assumptions. It is not a record of a real farm, and your first month will differ in the details. What should not differ is the order of operations.

Target values for the first month

These are the values to hold every day. They match the spec tables on the lettuce, basil and radish microgreen pages. [UCD-LET-01]

Two things in this table shape the whole month. First, lettuce and basil EC ranges do not overlap (1.2 is the top of one, 1.4 the bottom of the other), which is why basil gets its own tote. Second, nothing in the lettuce column is ready inside 30 days from seed — the first harvest has to come from the microgreen tier.

Days 1–3: build

Day 1 — rack, lights, power, water test. Assemble the rack (see choosing a grow rack), hang the lights and put them on a timer. Before buying nutrients, measure your source water: its EC and pH set your baseline. Workspace: create one system ("Spare room rack") and one reservoir with its volume in litres, source EC and source pH.

Day 2 — plumbing. Set NFT channels at a slope of 1:30 to 1:40 (25–33 mm of drop per metre) and plan for 1–2 L/min per channel. Flatter channels pool; steeper ones strip the film too fast for roots. Fill the basil tote and fit an air stone (choosing an air pump). Workspace: a note entry with channel count, slope and pump model.

Day 3 — fill with plain water. Run everything on plain water, no nutrient, no plants. Measure the flow at the end of each channel with a jug and a stopwatch: 1 L in 30–60 seconds is 1–2 L/min. Workspace: a note with the measured flow per channel.

Days 3–5: cycle the system

Leave the system running for 48 hours. You are looking for four failures, each of which is cheap now and expensive with plants in it:

1. Leaks and level loss. Mark the reservoir level. A drop larger than evaporation explains is a fitting.
2. Pump and timer behaviour. Confirm the pump restarts after a power cut and the light timer switches when you think it does. Pump failure is the fastest way to lose an NFT crop — roots in a dry channel last hours, not days.
3. Water temperature, day and night. Read it at the warmest point of the light period and just before lights-on. Lettuce wants 18–22 °C. If the reservoir climbs past 22 °C under the lights, deal with it now — see the root temperature and DO calculator and the next section.
4. Light at canopy height. Check PPFD where the leaves will be and convert it to DLI with the DLI calculator.

Calibrate both meters on day 4: pH with buffer solutions (choosing a pH meter), EC with a 1.413 mS/cm standard. Repeat the EC calibration weekly. Workspace: one reading entry per day with water temperature, plus a note recording each calibration.

Worked example: is your light right for lettuce?

The sizer assumes 120 W of LED per m² of lit shelf. At a fixture efficacy of 2.1 µmol/J that is about 250 µmol/m²/s at the canopy. DLI is PPFD × seconds of light ÷ 1,000,000:

• At 16 h: 250 × 16 × 3,600 ÷ 1,000,000 = 14.4 mol/m²/day — on the lettuce target of 14.
• At 14 h (the lettuce page's photoperiod): 250 × 14 × 3,600 ÷ 1,000,000 = 12.6 mol/m²/day — inside the 12–17 range.

Running lettuce at 14 h rather than 16 h cuts its lighting energy by 2 ÷ 16 = 12.5% and lowers bolting risk. If your measured PPFD is well below 250, you will need closer lights or more hours; the light distance tool helps with the first. [PPF-DLI-01]

Day 4: sow

Sow three things on the same day so the month has a rhythm.

• Lettuce, batch 1. Sow 10 cubes for 8 transplant spots — the extra 2 are an allowance for weak seedlings, an assumption you can tune after one batch. Lettuce sprouts in 2–5 days and is ready to transplant 10–14 days after sowing. Butterhead is the most forgiving first variety (butterhead lettuce).
• Basil. Sow 10 cubes for 8 spots. Basil sprouts in 5–10 days and transplants at 14–21 days.
• Microgreens. Sow 2 trays of radish. Radish takes a 2-day dark phase and 5–7 days of light. The germination calendar will back-plan the lettuce and basil dates from a target harvest day.

Workspace: start one batch per sowing — "Lettuce B1 (10)", "Basil B1 (10)", "Radish T1–T2" — and set each from planned to growing.

Then repeat on a fixed cadence: 8 lettuce every 7 days (40 channel sites ÷ 35-day cycle = 8 per week) and 2 microgreen trays every 3 days (7 trays ÷ 10-day cycle ≈ 0.7 trays per day).

Days 5–13: first nutrient and the daily check

On day 5, mix the first nutrient for the seedling station and lettuce reservoir at EC 0.8 — the bottom of the lettuce range, which suits young plants — and bring pH to 6.0. Use the nutrient calculator for doses and the pH calculator for adjustment. Mix the basil tote separately at EC 1.4 and pH 6.0.

The daily check takes about 10 minutes and always runs in the same order:

1. Water temperature (before you disturb the reservoir).
2. EC, then pH (adjust pH after EC, since nutrient additions move it).
3. Air temperature at canopy height, lights on.
4. A look at the roots, the cubes and the tray surfaces.

Workspace: one reading entry per reservoir per day containing all four numbers, plus a dose entry whenever you add nutrient or pH adjuster (product, ml, cost).

Worked example: top up or reset?

The site's EC guidance uses a 25% rule: top up if EC has drifted less than 25% from target, drain and refill if it is further off, and reset every 14 days regardless. Suppose the lettuce target is 1.0 mS/cm:

• Reading 0.85: (1.0 − 0.85) ÷ 1.0 = 15% off → top up with nutrient solution at target strength. Log a topup entry.
• Reading 0.72: (1.0 − 0.72) ÷ 1.0 = 28% off → full reset. Log a dump entry, then a new dose.

pH has its own rule: a drift of more than 0.3 in 24 hours means the solution is ageing and should be replaced. The pH drift page covers the other causes, and EC management explains why micronutrients drift faster than EC shows. [OSU-NUT-01]

Days 11–14: the first harvest

Radish sown on day 4 is ready on day 11–14 (7–10 days from seed). Cut with clean scissors above the mat, weigh the tray, and refrigerate. The radish page puts yield at 200–300 g per 1020 tray; the sizer assumes 250 g.

Workspace: move the batch to harvested and record the harvest in grams. If you sold or gave any away, enter the revenue; a zero is still a data point.

That first weight is worth more than its price. It is the first real number that can replace an assumption in the sizer — if your trays come in at 180 g rather than 250 g, every later projection should use 180.

Days 14–25: transplant and the first reservoir reset

Lettuce, day 14–18. Transplant once the first true leaves are out and roots show through the sides of the cube. Space at 20 × 25 cm in the channels. Raise reservoir EC from 0.8 to the 1.0 target over the following days. Workspace: a note on the batch with the transplant date — the 28–35-day count starts here, not at sowing.

First reset, day 19. Fourteen days after the day 5 fill, drain and refill regardless of what EC says. Log the dump and the new dose.

Basil, day 18–25. Transplant into the tote. Pinch above the second node once a plant has 4 sets of true leaves (week 3–4 after transplant). Basil wants 20–24 °C water and EC 1.6; it is the crop that tells you if the room is too cold.

Lettuce batch 2 (sown day 11) transplants on day 21–25, batch 3 on day 28–32, and so on.

Days 18–30: what usually goes wrong

The second half of the month is when the system is fully loaded for the first time. The problems that show up here are almost always one of these:

• Warm water, slimy roots. Water above 22 °C holds less oxygen and favours water moulds. Brown, slimy roots are root rot; limp heads with healthy-looking roots are often low oxygen (oxygen deficit). The root-zone temperature and dissolved oxygen post shows the oxygen ceiling falling from about 9.5 mg/L at 18 °C to about 8.7 mg/L at 22 °C. [DO-TEMP-01]
• Small black flies around the cubes. Fungus gnats breed in wet propagation media. Let the top 2 cm of media dry between waterings and put one yellow sticky card per m² at canopy height.
• Hot air, stretching or bolting lettuce. Air above 24 °C or a photoperiod over 14 h pushes lettuce to bolt. See heat stress.
• Mould on microgreen trays. Seeding too densely or humidity at the top of the 50–70% range. Thin the next tray rather than treating this one.
• Brown leaf edges on lettuce. Usually tipburn from calcium transport, not a nutrient shortage — see calcium deficiency.

If a symptom does not match any of these, take a photo and run it through AI plant diagnosis before changing two variables at once.

The month at a glance

Worked example: what the month produces and costs

Using the sizer's assumptions for this 4 m² rack:

• Microgreens. Trays sown on days 4, 7, 10, 13, 16 and 19 are all ready by day 30: 6 sowings × 2 trays = 12 trays. At 250 g each that is 3.0 kg, with a range of 2.4–3.6 kg at the radish page's 200–300 g per tray.
• Lettuce. Zero kg in the first 30 days. From day 42–53 onwards, the 40-site channel tier settles at about 2 m² × 3.0 kg ÷ 35 days × 7 = 1.2 kg per week (8 heads × 150 g).
• Electricity for lights. 4 m² × 0.12 kW × 16 h × 30 days = 230.4 kWh. At an assumed $0.15 per kWh that is $34.56; at $0.30 it is $69.12. The real first-month figure is lower because shelves sit half-empty in week 1 and blackout trays need no light. Look up your own tariff from your bill; the US EIA publishes average prices by state.
• Setup. 4 m² × $190–260 = $760–1,040, spent before day 4.

The point of the arithmetic is the shape, not the totals: the first month is almost all cost, the only revenue-capable output is microgreens, and lettuce income starts in week 7. If you plan to sell, the microgreens chapter and selling what you grow pick up from here. The ROI estimator runs the same numbers over three years.

Logging it so day 30 means something

A daily log is not paperwork for its own sake. By day 30 it answers questions you cannot answer from memory: how fast EC drops per day under a full channel load, how warm the reservoir gets on the hottest afternoon, how much each tray actually weighed, and which batch was sown when. Those numbers decide whether month two needs a chiller, a second reservoir or a different seeding rate.

In the workspace, the structure is: one system per rack, one reservoir per tank, one batch per sowing, a reading or dose in the log for every check and addition, and a harvest in grams for every cut. The free workspace covers one system and one reservoir, and keeps 30 log entries per reservoir — enough for one combined reading per day for this month, but not for separate pH, EC and temperature lines. The Grower plan removes those limits and adds reminders for reservoir changes; if you stay on the free plan, write the 14-day reset dates on the reservoir itself.

See also

• Small farm sizer — the assumptions behind every number in this plan.
• Hydroponic parameter reference — pH, EC and temperature for other crops.
• Lighting for seedlings and microgreens — light for the seedling station and the tray tier.
• Running the farm through winter — what changes when the room gets cold.
• Root rot prevention guide — the failure most likely to end the first month early.