What is week one of feeding, and when does it actually start? Most hydroponic nutrient charts assume week one begins the moment a plant goes into its system, but that dosage was designed for clones taken from an already mature mother plant — not a seedling fresh out of a grow cube. Feed a young seedling at full week one strength and nutrient burn is the near-certain result. This guide breaks down when week one genuinely begins depending on whether you're growing from a clone or from seed, and what EC range to target at each stage.
🌱 Why week one feeding charts confuse growers
Most feeding charts are written with clone-grown plants in mind. A clone is a genetically identical cutting taken from a mother plant that's already reached sexual maturity — typically 6–8 weeks after germination. Because the clone shares the mother's mature root and tissue structure, it can handle full-strength nutrients as soon as it forms roots of its own.
A seedling has no such head start. It's an entirely new plant working through its first weeks of growth, and its main job early on is building chlorophyll — not absorbing a full dose of nutrients.
🌿 Growing from clones: feeding starts at week one
If you're growing from a clone, week one begins as soon as roots have formed. There's no need to ease into it — the plant's tissue is already mature, so it can process the nutrient strength listed as "week one" on most feeding charts straight away.
🌱 Growing from seed: the foundational phase
A seedling takes roughly two to four weeks before it's considered a young plant. During this period, feeding it at full week one strength on most charts will overwhelm it — the dosage is calculated for clone-sized root systems, not a 10cm seedling.
Instead, grow the seedling for three to four weeks on a weak nutrient solution, alongside a root stimulant to encourage faster root development. This foundational phase is easy to skip, but skipping it is one of the more common causes of reduced yield later in the grow.
💡 A-Grade Tip: A small amount of magnesium and nitrogen supports chlorophyll production in young seedlings. An all-in-one additive like Humiboosta, which also contains calcium and iron, works well here — it's largely preventative, keeping seedlings looking healthy rather than correcting a deficiency after it appears.
📏 Measuring nutrient strength with an EC meter
Guessing nutrient strength by eye is how most seedlings end up overfed. An EC meter measures the electrical conductivity of your nutrient solution, giving a direct reading of concentration rather than a guess based on the feeding chart alone. It's one of the more important tools for any grower feeding from seed, since the margin for error is much smaller than with an established clone.
📊 EC targets by growth stage
| Stage | EC range | Status | Notes |
|---|---|---|---|
| Seedlings (0–4 weeks) | 0.3–0.6 EC | Foundational phase | Weak solution plus root stimulant; not full week one strength |
| Seedlings/clones, 4+ weeks | 0.6–1.6 EC | Vegetative growth | Roughly 2–4 weeks at this range before flowering nutrients begin |
| Flowering | 1.6–2.4 EC | Bloom phase | Typically maintained for 6–12 weeks depending on variety |
| Maturation / flush | 0.0–0.4 EC | Flushing period | 5–10 days of plain or near-plain water before harvest |
Summary
If you're growing from a clone, week one starts as soon as roots have formed — there's no need to hold back. If you're growing from seed, spend three to four weeks on a weak solution, roughly half the strength of a standard week one dose, before stepping up to full feeding. Browse A-Grade Hydroponics' plant boosters range or EC meters to put this into practice, and get in touch if you'd like a hand building a feeding schedule for your setup.
