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Specifications · Process
Harvest mature leaves, dry under controlled temperature and light to below 7.5% moisture, then grind and sieve to a consistent mesh. Sounds simple — but every variable from planting density to drying temperature defines the colour, nutrient retention and microbial safety on the COA.
Grow · Dry · Mill
The three-step sequence looks trivial. The variables inside it — spacing, leaf maturity, harvest timing, wash water, load per square metre, mill temperature — are what separate a bright-green, spec-clean lot from a brown, borderline one.
Density & leaf maturity
Intensive leaf systems at ~444k plants/ha, cut at ~50 cm, 15–20 cm above ground, every 35–40 days. Mature dark-green leaves only — pale shoots dilute protein and mineral density.
The quality gate
The step with the strongest documented impact on colour and heat-sensitive nutrients. Shade-drying (2–3 days) or 35–55 °C cabinet/solar at ≤2 kg/m². Direct sun = warnings in every primary guide.
Mesh locks spec
Stainless hammer mill, then sieves to 60/80/100/200 mesh. Mesh and moisture must hit the COA statement — not a brochure.
Budidaya
Commercial leaf production is closer to a leafy vegetable than tree farming. High density plus frequent cutting maximises leaf yield per hectare while keeping stems thin enough to process.
Panen
Harvest fully expanded, mature, dark-green leaves — not young pale-green shoots at the tip. Mature leaves carry richer mineral and protein profile; immature growth dilutes the batch.
Pasca-panen
Leaf is perishable. Heat, bruising and delay accelerate chlorophyll breakdown and microbial multiplication. What happens between cutting and the drying floor dominates the finished COA more than buyers expect.
Pengeringan
Chlorophyll, vitamin C and polyphenols degrade under heat and light. Lower temperature + no direct sun = slower degradation. A shade-dried powder is brighter and analytically richer than a sun-dried control from the same harvest — visible in L*a*b* and on the COA.
Ask for drying-process records and L*a*b* colorimeter readings (higher negative a* = greener) plus the batch COA showing moisture below 7.5%. Indonesia’s equatorial dry season suits shade-drying — verify the processor actually practices it.
Milling
Once brittle, leaves go through a stainless hammer mill and then sieves to the contracted mesh. Finer grinding costs milling energy and yield — expect FOB to reflect it. Hygroscopic re-absorption is immediate after milling, so the powder must be re-dried/packaged quickly with a foil barrier + desiccant.
Ask & reject rules
Process leaves traces on the COA. Here is how to read them.
Immature shoots dilute protein and minerals — check the cutter’s selection rule.
Note
Ask the SOP line on leaf maturity.
Below 55 °C, ≤2 kg/m², 2–3 days to below 7.5%. Above that, colour and vitamin C fall.
Note
Request temperature records and moisture pre-shipment.
Browning = heat/sun, slow drying, or old stock. No recovery after.
Note
Visual + a* channel if available.
500-mesh ~25 µm is micronization — demand d50/d90, not just “500 mesh”.
Note
Sieve analysis per lot.
Feed-grade or wood-contaminated bulk is not leaf powder — reject. The checks above are cheap compared to a rejected container.
Process FAQ
Yes — and it is documented in both CGIAR and Farm Africa guidance. Chlorophyll degrades under heat and direct solar radiation, and vitamin C and polyphenols are similarly light- and heat-sensitive. Shade drying (or cabinet drying at 35–55 °C) preserves bright green colour and higher levels of those compounds compared to open sun drying on concrete or metal. The difference shows in colour (L*a*b*) and — if tested soon after production — on vitamin C and polyphenol figures. Direct sun drying is explicitly warned against in the primary agronomic literature.
PKM-1 is a variety widely associated with intensive leaf production in South Asia. Its first harvest arrives around 60 days after sowing, with subsequent cuts every ~45 days under organic protocols. Other varieties are in commercial use across Indonesia, Tanzania and West Africa. Variety alone does not define quality, but when a supplier makes specific yield claims it is worth asking which variety they grow and whether the cited figure comes from the same growing conditions. Likewise, mature dark-green leaves (not pale young shoots) carry richer mineral and protein profiles — a cutting rule that matters more than the variety name.
Moringa leaf powder strongly re-absorbs humidity after milling — immediate and significant per CGIAR documentation, which is why the powder must be re-dried after milling before packing. Without a foil barrier plus desiccant plus good seal, the moisture you paid to achieve (below 7.5%) climbs back during transit or storage. That drives caking, off colour and microbial risk. Ask the supplier about barrier and desiccant and confirm the moisture on the COA is the lot you are buying, not a reference.
500 mesh (~25 µm) is micronization territory. It requires more milling passes, more energy, and the particle re-absorbs moisture even faster. For most supplement and beverage applications there is no evidence that going below 100 mesh (~150 µm) improves performance meaningfully, and the extra fineness can hurt flow on encapsulation lines without a flow agent. If you genuinely need sub-25 µm for a cosmetic emulsion, confirm it with a measured d50/d90 — not just a sieve-pass claim.
Related specifications
Processing explains the COA. The guides below help you write the one you will enforce.
Brief the desk
Tell us your mesh, moisture, colour and application. We translate the process you just read into the line items your PO and COA need to carry.
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