Mother Earth Root Down Plant Starter Mix is a granular fertilizer with elevated phosphorus to encourage vigorous root development in seedlings, young plants, and transplants, carrying a guaranteed analysis of 3-6-3 (N-P-K). The maker publishes it in one size, 4.4 lbs, under part number HGC733957. This page gives the maker’s published analysis, ingredient blend, and application rates, and is explicit about what the maker does not publish. It is a dry, granular starter amendment worked into soil — not a liquid feed you dilute in a reservoir.
What it is
Root Down is the starter-stage member of the Mother Earth dry amendment range. The maker describes the blend as containing feather meal, fish bone meal, bat guano, alfalfa meal, kelp meal, and more, which together feed plants the primary and secondary nutrients they need for comprehensive early-stage nutrition. The point of the formulation is the middle number: the maker states its elevated phosphorus content (6%) is specifically geared to stimulate root growth. It arrives in granular form, easy to apply and giving a steady release of nutrients directly to the root zone, and the maker positions it as the fix for weak starts, helping delicate young plants establish quickly and adapt to a new home.
Guaranteed analysis and specifications
| Guaranteed analysis (N-P-K) | 3-6-3 |
|---|---|
| Total Nitrogen (N) | 3.0% |
| Available Phosphate (P2O5) | 6.0% |
| Soluble Potash (K2O) | 3.0% |
| Ingredient blend (as named by the maker) | feather meal, fish bone meal, bat guano, alfalfa meal, kelp meal, and more |
| Form | granular, steady-release into the root zone |
| Size (maker’s published size) | 4.4 lbs |
| Maker part number | HGC733957 |
| Case pack (store catalog code) | 6/CS — a distributor pack code from the catalog title, not a maker specification |
The header analysis is the maker’s own figure; the per-nutrient percentages (3.0% total nitrogen, 6.0% available phosphate, 3.0% soluble potash) are as printed on a carrying retailer’s label breakdown. No secondary-nutrient or micronutrient percentages are published, and the maker names its ingredients rather than publishing a formal derived-from statement.
Why choose Root Down
- It is aimed at one job. Most all-purpose dry amendments run a balanced or nitrogen-forward analysis; this one is deliberately phosphorus-forward, and the maker ties that elevated phosphorus content (6%) directly to root development.
- Two application windows from one bag. The maker lists it as ideal for pre-planting or as a weekly top-dress during early growth, so the same product covers mixing-in and feeding.
- A dry blend, not another bottle. Because it is granular and releases steadily into the root zone, there is no mixing, no reservoir, and nothing to keep in suspension.
Recommended uses
The maker’s own ideal-for list is seedlings and young plant propagation; transplants, to reduce shock and encourage new root growth; establishing new container plants or garden beds; and growing vegetables, fruits, flowers, and herbs from their earliest stages. That is a short list on purpose — it is a starter amendment, and every use the maker names sits in the first weeks of a plant’s life.
Where it fits in a feeding program
Root Down is a soil-side amendment, so its fit is defined by the medium and the growth stage, not by a nutrient line it has to pair with.
- Medium: the maker’s directions are written for soil — both pre-plant use in containers and top-dressing during early growth are stated in terms of soil volume and soil surface area.
- Stage: the maker frames the product around the early stages of a plant’s life and helping young plants establish and adapt, which is where a phosphorus-forward analysis earns its place.
- Crops: the maker names vegetables, fruits, flowers, and herbs, plus new container plants and garden beds.
The maker does not state a hydroponic or coco use, a pH range, or compatibility with any specific liquid nutrient line, so none is claimed here.
Application rates (maker directions)
These are the maker’s published rates for this product. They are per volume of soil and per soil surface area, because this is a dry amendment — do not treat them as a per-gallon-of-water dilution.
- Pre-plant, in containers: the maker directs adding 2 tablespoons per gallon of soil and mixing well.
- Top-dressing: the maker directs applying 2 tablespoons per gallon of soil (or 2 cups per 12 sq ft of soil surface area) evenly to the soil surface.
- Work it in, then water: the maker says to blend it into the top layer of soil to avoid caking, then water thoroughly.
- Frequency: the maker advises that consistent weekly application for the first few weeks can dramatically boost root mass.
Follow the label on the bag you receive; the maker publishes no further rate breakdown by crop, pot size, or bed depth, and none is inferred here.
How it compares to other early-stage inputs
This table is about role, not a performance ranking.
| Factor | Root Down (this product) | A single-ingredient dry meal | A liquid root stimulant |
|---|---|---|---|
| Composition | a blend of feather meal, fish bone meal, bat guano, alfalfa meal, kelp meal, and more | one meal, one nutrient profile | a dilute liquid, usually applied as a drench |
| Analysis | 3-6-3 | varies widely by meal | often a low or partial analysis |
| How it is applied | mixed in pre-plant, or top-dressed weekly in early growth | mixed into the medium | diluted in water at each feed |
Starting a tray of seedlings or potting up transplants? Add to cart, or talk to a grower about matching a starter amendment to your soil mix.
Sources
- Mother Earth Products — Root Down Starter Mix 3-6-3 maker product page (HTTP 200 via WAF-immune fetch_maker, retrieved 2026-07-19; PRIMARY source): part number HGC733957; granular fertilizer with elevated phosphorus for seedlings, young plants and transplants; targeted NPK 3-6-3 with elevated phosphorus content (6%); ingredient blend of feather meal, fish bone meal, bat guano, alfalfa meal, kelp meal and more; primary and secondary nutrients for comprehensive early-stage nutrition; granular form with steady release to the root zone; ideal for pre-planting or as a weekly top-dress during early growth; ideal-for list (seedlings and young plant propagation, transplants, new container plants and garden beds, vegetables/fruits/flowers/herbs); application rates (pre-plant in containers, 2 tablespoons per gallon of soil mixed well; top-dress 2 tablespoons per gallon of soil or 2 cups per 12 sq ft of soil surface area, blended into the top layer to avoid caking then watered thoroughly; consistent weekly application for the first few weeks); available sizes 4.4 lbs: https://mother-earthproducts.com/products/mother-earth-root-down-starter-mix-3-6-3
- Greenhouse Megastore — Mother Earth Root Down Plant Starter Mix 3-6-3 (HTTP 200, allow-listed carrying retailer, retrieved 2026-07-19; prints the label breakdown the maker page does not): Guaranteed Analysis — Total Nitrogen (N) 3.0%, Available Phosphate (P2O5) 6.0%, Soluble Potash (K2O) 3.0%: https://www.greenhousemegastore.com/products/mother-earth-root-down-plant-starter-mix-3-6-3
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