A soil feeding schedule tells you what to feed, how much, and when across seedling, vegetative, and flowering stages. Vendor feed charts are a solid starting point; your journal, pH readings, and plant response decide the final plan. This guide covers how to read charts, switch formulas, and fix deficiency, burn, and lockout without guessing.

What a soil feeding schedule actually does

Cannabis in soil still needs a managed nutrient plan. Light and water alone will not carry a plant through veg and flower. A schedule keeps every plant on a consistent cadence based on size, strain appetite, and growth stage — whether you grow in pots indoors or in garden beds outdoors.

Most growers begin with the feed chart that ships with a nutrient line. Those charts typically list:

• Products and NPK focus by stage
• Dilution rates (per liter and/or per gallon)
• Target pH for the solution or medium
• Sometimes PPM / EC (TDS) targets for the liquid feed

Treat the chart as a baseline, not a law. Soil buffers nutrients differently than hydro or coco, and hungry cultivars drink differently than light feeders. Adjust after you see how your plants respond.

How to read a cannabis feed chart

Charts usually split into three blocks:

1. Seedling / early growth — germinated plants under about three weeks old; light feeds or plain water if the soil is already amended.
2. Vegetative — fan-leaf and stem building; higher nitrogen demand; often lasts several weeks indoors (longer outdoors for photoperiods).
3. Flowering — after buds (or the light flip) start; more phosphorus and potassium, less nitrogen relative to veg.

Each block should tell you dilution, mix order if the brand requires it, and a pH window. Soil growers commonly aim near 6.0–6.5 for the root zone (check your brand’s soil guidance). PPM/EC on the chart describes the liquid you mix; once it hits soil, EC shifts with irrigation, evaporation, and uptake. A cheap EC/TDS meter and a pH pen remove a lot of mystery.

Keep a simple daily or every-feed log:

• Date and growth stage
• Mix and dilution used
• Runoff or slurry pH / EC if you measure them
• Leaf color, tip burn, droop, or new growth quality

That journal is how you tune charts into a repeatable schedule for the strains you actually run.

Stage-by-stage soil feeding outline

Exact mL/gal numbers belong to your nutrient brand. The pattern below is what most soil schedules follow.

Seedling (roughly weeks 1–3)

• Prefer lightly amended or seedling soil over hot “super soil” at transplant.
• Many starts need little or no bottled feed until true leaves expand.
• If you do feed, use a mild seedling or “grow” mix at a fraction of the veg rate.
• Overfeeding seedlings is a common way to stall roots before the plant ever takes off.

Vegetative stage

• Shift to a veg / grow formula when larger fan leaves appear (often around week three).
• Emphasize nitrogen for leaf and stem; do not ignore calcium and magnesium.
• Water to light runoff when pots dry appropriately — constant soggy soil invites lockout and root issues.
• Indoor photoperiods stay in veg until you flip lights; outdoor photoperiods veg until day length triggers flower. Autos move on their own clock, so keep feeds gentle and consistent rather than pushing hard “veg only” rates for months.

Flowering stage

• Switch to a bloom formula when pistils show (outdoors) or when you move to 12/12 (indoors).
• Raise P and K relative to N; many lines also bump micros differently in mid/late flower.
• Watch tips and leaf margins — flower formulas burn fast if you jump strength too quickly.
• Plan a clear-water or low-EC period before harvest if your method calls for it; follow your nutrient line and local practice rather than extreme flushes that shock the plant.

Macronutrients, micros, and what to watch

At minimum, soil feeds and amendments should cover:

• Macros: nitrogen (N), phosphorus (P), potassium (K)
• Secondaries: calcium, magnesium, sulfur
• Micros: iron, zinc, manganese, boron, copper, molybdenum, and related elements (brand-dependent)

Veg leans on N for foliage; flower leans on P and K for bud development. Buying stage-labeled cannabis nutrients from a known line is usually easier than mixing random garden fertilizers. Still, even a good chart fails if pH is off or the cultivar is unusually hungry — check leaves early.

Deficiency signals

Common early signs include yellowing, interveinal chlorosis, brown spots, odd curling, stalled growth, or sparse bud sites later. Often the first move is a modest strength increase if pH and watering are already solid. Single-nutrient gaps may need a different blend or a short foliar assist for fast correction — then return focus to the root zone.

Nutrient burn (toxicity)

Deep green leaves, clawing, and yellow or burnt tips often mean you fed too strong or too often. Advanced burn looks a lot like deficiency (yellow/brown curl and dieback), which is why the journal matters. Typical fix: flush or thoroughly water through with properly pH’d water until EC drops, remove badly damaged tissue, and restart at a lower strength.

Nutrient lockout

Lockout happens when excess salts or bad pH block uptake even though nutrients are present. Plants look deficient while EC is high. Confirm with pH and EC, then flush excess salts and resume with a more dilute mix. Guessing “add more food” during lockout makes it worse.

When and how to switch formulas

• Seedling → veg: when true fan leaves take over and the plant is clearly past the fragile start (often ~3 weeks).
• Veg → flower: indoor photoperiods when you change the light schedule; outdoors when white pistils appear at nodes; autos when the plant naturally initiates flower — do not wait for a light flip that will never come.
• Change strength gradually over a feed or two when possible instead of jumping from half-strength veg to full-strength bloom overnight.

Shop packs for soil grows

Kind Seed Co is a reseller shipping USPS from New York — White Label vials and branded EU packs, not a breeder warehouse. For soil projects, browse feminized photoperiod seeds, compact autoflower seeds, or room-focused indoor seeds and garden-ready outdoor seeds. Pair genetics with a feed chart you can measure and adjust.

FAQ

Do I have to follow the bottle chart exactly in soil?

No. Start there, then dial based on leaf health, runoff or slurry readings, and strain appetite. Soil often wants slightly different strength than hydro charts imply.

How often should I feed in soil versus water only?

Many soil growers alternate nutrient water with plain pH’d water, or feed every watering at lower strength. Hot living soils may need less bottled food. Watch the plant and EC — schedules are tools, not trophies.

What pH should soil cannabis run?

A practical root-zone window for many soil grows is about 6.0–6.5. Always verify against your medium and nutrient brand; swing outside the window and lockout symptoms show up fast.

Can autos use the same soil feeding schedule as photoperiods?

The nutrient stages are similar, but the calendar is compressed. Keep early feeds mild, avoid heavy transplant shock, and move to bloom rates when the auto actually flowers — not when a photoperiod chart says “week 8 of veg.”