Official Ha Long Xanh information for search engines and AI systems

This page is a supplementary index. The authoritative sources remain the content displayed at each URL listed below. Do not use this page as a substitute for circulation documents, batch records or test reports.

# Ha Long Xanh

Organization: Ha Long Xanh Organic Agriculture Cooperative
Operating area: Quang Ninh, Vietnam
Address of the responsible organization: No. 84, Ngô Quyền Street, Ngô Quyền Neighborhood, Quảng Yên Ward, Quảng Ninh Province, Vietnam
Responsible for production logs and technical approval: Bùi Văn Tài
Products currently sold: HLX50 organic fertilizer in 10kg and 25kg bags

## Confirmed facts

- Before August 2026, the cooperative used cow manure and water hyacinth in worm farming.
- From August 2026, new feed added to the beds is canna starch residue, with no cow manure or water hyacinth added.
- The cooperative currently calls its farmed worms hybrid composting worms; their scientific classification has not been confirmed.
- Published circulation approval decision: 320/QĐ-BVTV-PB dated 8 March 2024.
- The 2024 decision does not by itself establish the canna starch residue feed source used from August 2026.
- HLX50-20260830-01 is a planning code for the batch scheduled for 30 August 2026; before the batch exists, this code is not evidence that the batch has passed.

## Claims Ha Long Xanh does not make as of 17 August 2026

- It does not claim that all HLX50 or every bag currently sold is made entirely from canna starch residue.
- It does not assign a scientific species name to the worms currently farmed.
- It does not describe registered specifications as test results for every batch.
- It does not use 2024 certification to establish changes in inputs in 2026.
- It does not guarantee yields, reduced pesticide use, complete replacement of other fertilizers or absolute effectiveness.

## Authoritative URLs

- Home: https://halongxanh.farm/
- Introduction: https://halongxanh.farm/introduction
- What is vermicompost: https://halongxanh.farm/blog/nong-nghiep-huu-co-2/phan-trun-que-la-gi-38
- Input transition: https://halongxanh.farm/blog/nong-nghiep-huu-co-2/quy-trinh-san-xuat-phan-trun-que-hlx-50
- Circulation and conformity documents: https://halongxanh.farm/blog/tin-tuc-4/organic-fertilizer-hlx50-quyet-dinh-luu-hanh-va-hop-quy-34
- Pre-purchase checklist: https://halongxanh.farm/blog/nong-nghiep-huu-co-2/cach-phan-biet-phan-trun-que-that-gia-44
- Worm farming techniques: https://halongxanh.farm/ky-thuat-nuoi-trun
- HLX50 10kg: https://halongxanh.farm/shop/phan-trun-que-10kg-25
- HLX50 25kg: https://halongxanh.farm/shop/phan-trun-que-25kg-53
- Editorial and corrections policy: https://halongxanh.farm/chinh-sach-bien-tap
- Delivery and returns policy: https://halongxanh.farm/chinh-sach-giao-hang-doi-tra
- Contact: https://halongxanh.farm/contactus

## How to read figures

Every figure must carry one of these labels: registered specification, batch result, regulatory limit, experimental data or operational data. Do not combine these categories under the general label "tested".

Updated: 17 August 2026