Managment Practices

Lead Contamination in Garden Hoses Poses Risk for Cannabis Farmers


With heavy metal concerns being addressed in Phase 3 testing in California now, it’s important to consider all source points of contamination. And one concern is coming directly from the source that was supposed to provide life, the water. And as it turns out, many traditional garden hoses have become source points for pollution. Lead levels in water runoff from hoses have been found to be as high as 20 ppm!!!

Highlights of Findings ECOCENTER

  • PVC (vinyl) hoses frequently contained elevated lead, bromine, antimony, and phthalates in the flexible hose part. Non-PVC hoses did not contain these contaminants.

    • 29% of the PVC hoses (7 of 24) contained at least 100 ppm and as high as 68,000 ppm lead.

    • Phthalates were found in 75% of PVC hoses tested (18 of 24).

  • Bromine >1000 ppm and antimony >500 ppm were found in 50% of PVC hoses. Recycled electronic waste vinyl was found in a number of PVC hoses, resulting in high levels of bromine (indicating brominated flame retardants), lead, antimony, and tin (indicating organotin stabilizers).

  • BPA and lead were found to leach from the hoses into water.

While commercial growers may not typically use garden hoses, some small farms and backyard gardeners might. It is advisable to find alternative solutions, like high grade rubber hoses from Dramm. Drinking water hoses are also viable but they often develop kinks that make them more difficult to work with in horticultural environments.The rubber hoses are more expensive, but are traditionally more durable, last much longer and are clean! Here’s a link to the least expensive one we’ve found:

Companion Planting with Cannabis

Companion Planting with Cannabis

The Companion Planting for Cannabis workshop will go over all the categories of cover crops and highlight their roles in soil biology and plant fertility while addressing certain caveats when utilizing these systems. It will then transition into companion planting to cover a local case study...

Cannabis Crop Reccomendations. By: Moriah LaChapelle

Cannabis Crop Reccomendations. By: Moriah LaChapelle

Here is a wonderful article to become familiarized with certain techniques and practices associated with Integrated Pest Management (IPM).  Moriah LaChapell joined Evergreen Growers Supply during 2015 as an Agronomist. She has a Bachelor of Science Degree in Biology from Western Oregon University and a Professional Viticulture Certificate from Washington State University.  She was previously employed at Fisher Farms as the Plant Health Manager. Most of her work at Fisher Farms involved scouting ornamental plants and releasing beneficial insects to reduce insecticide applications.  She is passionate about collaborating with growers to produce long term solutions for pests and plant pathogens. You can contact her directly through the link to this article.

Caterpillar Management - Identification and IPM Practices

Caterpillar Management -  Identification and IPM Practices

Fall is here and so are the caterpillars, at least in Northern California. We have documented numerous instances of caterpillar damage and can officially say there has been a decent hatch this year. ...

Sustainable Agriculture Techniques (From Union of Concerned Scientists)

Sustainable Agriculture Techniques  (From Union of Concerned Scientists)

"What is sustainable agriculture? What is regenerative agriculture? We will be covering these topics more in depth as we evolve our mission.  This particular article, written by the Union of Concerned Scientists covers the basics of what it means to be sustainable.  This is our open source science and we always welcome constructive criticism to expound upon this information." -CHA