Quality Assurance
Hibiscus quality is decided on the drying mat, on the sifting table and at the laboratory bench — long before a container is sealed. Here is how we control it.
Specify. Sift. Test. Document. Repeat.
We do not rely on the phytosanitary certificate alone. Quality is built through a sequence of checks, each catching problems that would be expensive to find at your border or your factory.
Every order starts with a written specification: grade and format, colour, admixture, moisture, ash and the food-safety limits of your market. From there our team applies checkpoints at buying, on intake, during sifting and at bagging. An accredited laboratory analyses each lot, the Nigeria Agricultural Quarantine Service inspects it and supervises fumigation before export, and we actively support third-party inspection by the buyer's nominated agency.
- Written spec per contract
- Farmer-group selection
- Drying & storage supervision
- Intake moisture, colour & admixture
- Sifting & hand-picking to spec
- Laboratory analysis per lot
- NAQS inspection & fumigation
- Loading photographs & report
Six Stages of Control
1. Farm & Harvest
We buy from farmer groups that harvest calyces at full colour, de-seed cleanly and dry on mats, racks or tarpaulins. Calyces dried on bare earth pick up the sand, dust and moulds that cause rejections.
2. Intake Check
Every lot arriving at the warehouse is checked for moisture, colour, admixture, live insects and off-odours before acceptance. Damp or infested lots are rejected or re-dried and treated before entering stock.
3. Sifting & Sorting
Vibrating screens remove seeds, dust and broken pieces, aspiration lifts out light trash, and hand-pickers remove stems and foreign matter. Grade A, Grade B and cutting stock are separated at this stage.
4. Laboratory Analysis
Representative samples from each lot go to an accredited laboratory for moisture, total and acid-insoluble ash, microbiology and — as your market requires — multi-residue pesticide screening and heavy metals.
5. NAQS Inspection & Fumigation
The Nigeria Agricultural Quarantine Service inspects bagged lots for quarantine pests, supervises fumigation by a licensed operator and issues the phytosanitary certificate with the declarations your destination requires.
6. Loading Inspection
Bag counts, weights, container cleanliness, lining and absence of live insects are verified at stuffing. Photographs and a loading report accompany the shipping documents.
What the Numbers Mean
The parameters that define export-grade dried hibiscus, and why each one matters to your process and your border authority.
| Parameter | What it tells you | Why it matters | Method |
|---|---|---|---|
| Whole-calyx content / purity | % of sound whole calyces by weight | What you are paying for; defines Grade A vs Grade B | Sieve & hand-pick analysis |
| Admixture / foreign matter | Seeds, stems, sand, dust, other plant material | Processing loss, cup clarity, contamination risk | Visual & sieve |
| Moisture | Water content of the calyx | Above limit, flowers mould and darken in transit | Oven method / calibrated meter |
| Colour | Deep red / burgundy vs brownish | Infusion colour and freshness; brown means old or rain-damaged stock | Visual vs retained sample |
| Total & acid-insoluble ash | Mineral content and sand | Pharmacopoeia and tea-industry purity limits | Gravimetric, accredited lab |
| Microbiology | TPC, yeast & mould, E. coli, Salmonella | Mandatory food-safety limits in EU, USA and Mexico | ISO methods, accredited lab |
| Pesticide residues | Residue levels vs. MRLs | EU MRL, EPA tolerance and COFEPRIS compliance | Multi-residue screen (LC/GC-MS) |
| Heavy metals | Lead, cadmium, arsenic, mercury | Contaminant limits for herbal infusions | ICP-MS, accredited lab |
| Live insects / khapra beetle | Infestation at inspection and loading | Quarantine pest — grounds for rejection, especially in Mexico | NAQS visual inspection & trapping |
Third-Party Inspection Welcome
For first orders, letters of credit or large programmes, many buyers appoint an independent inspection company. We welcome it. Agencies such as SGS, Bureau Veritas, Intertek and Cotecna can be engaged to draw samples, perform admixture and moisture analysis, send samples to the laboratory, verify weights and bag counts, and supervise fumigation, container stuffing and sealing, with testing to the standard you specify.
We coordinate access, scheduling and sampling with the inspector and build the inspection, fumigation and laboratory timeline into the shipment plan so that it does not delay the vessel booking. Inspection fees are normally for the buyer's account unless otherwise agreed.
Protecting the Flower Between Lagos and Your Factory
Dried hibiscus is hygroscopic and attractive to stored-product insects: too much moisture and it moulds and browns; any surviving infestation multiplies in a warm container. We ship only flowers at or below the contracted moisture, fumigate bagged stock and the stuffed container under certificate, line containers with kraft paper and stow bags away from the walls and roof.
We recommend buyers inspect and ventilate promptly on arrival and store below 25 °C away from light to preserve colour. These practices protect your cargo, your infusion quality and your delivery schedule.
Have a Specification to Meet?
Send us your target cleanliness, moisture, colour and food-safety limits. We will tell you plainly which grade meets them and how we will prove it.