The Access to Cannabis for Medical Purposes Regulations (ACMPR) has revolutionized the Canadian landscape for medical cannabis, offering a sanctioned pathway for patients to access this natural remedy. For those who grow cannabis under an ACMPR license, the question of long-term storage arises sooner or later. Whether you’re growing more than you can immediately consume, or you’re preparing for future medical needs, long-term preservation is crucial. In this comprehensive guide, we’ll explore the various aspects of cannabis preservation under the ACMPR license, focusing on techniques for long-term storage and relevant regulations that you need to adhere to.

ACMPR license cannabis Storage

The Need for Cannabis Preservation

Preservation is essential for maintaining the potency, flavor, and medicinal properties of cannabis. As a perishable product, cannabis deteriorates over time, losing its therapeutic value. Key reasons for effective cannabis storage include:

  1. Maintaining Potency: Cannabinoids degrade over time, affecting the therapeutic impact of the plant.
  2. Preserving Flavor: Terpenes, responsible for the flavor and aroma, can evaporate or change, altering the user experience.
  3. Preventing Mold and Bacteria: Poor storage can lead to mold growth and bacterial contamination, posing health risks.

ACMPR Guidelines for Storage

  1. Secure Storage: The ACMPR regulations mandate secure storage that prevents unauthorized access. This could range from lockable cabinets to specialized cannabis storage units.
  2. Quality Control: Although ACMPR doesn’t explicitly outline storage methods, it does stipulate that medical cannabis should maintain its quality, which indirectly means proper storage is essential.
  3. Documentation: Record-keeping of storage conditions, durations, and any quality checks are imperative to remain compliant with ACMPR regulations.

Optimal Storage Conditions


  1. Cool But Not Cold: Excess heat can dry out the cannabinoids and terpenes. Conversely, storing cannabis in too cold conditions can make trichomes brittle and easy to break off.


  1. Controlled Humidity: Ideal relative humidity ranges from 55% to 62% for curing and storage. Products like humidity control packs can help maintain these levels.


  1. Dark Conditions: Light is one of the biggest contributors to cannabis degradation. Storing in a dark place preserves its quality.

Air Control

  1. Limited Exposure: While some air is necessary to prevent mold, excessive air can speed up the degradation process. Vacuum-sealed containers can strike a good balance.

Long-Term Storage Solutions

  1. Glass Jars: Airtight, UV-protected glass jars are ideal for maintaining freshness and preventing light exposure.
  2. Vacuum Sealing: For very long-term storage, vacuum sealing can help, although care should be taken to avoid crushing the buds.
  3. Specialized Cannabis Containers: There are containers specifically designed for cannabis storage that control humidity and are airtight.
  4. Climate-Controlled Units: For bulk storage, climate-controlled storage units can offer an excellent, though costly, solution.

Shelf-Life Considerations

  1. Review and Rotate: Older stocks should be used before newer ones, so always mark the storage date clearly.
  2. Quality Checks: Regularly inspect your stored cannabis for signs of mold, pests, or degradation.
  3. Sample Testing: For long-term storage, periodic potency testing may be beneficial, though this may not be practical for most home growers.

Storing cannabis for long-term use is an art that requires knowledge and adherence to best practices. Under the ACMPR license, it’s not just about throwing your harvested buds in a jar and forgetting about them. You must consider temperature, humidity, air control, and light exposure, not to mention the crucial aspect of secure storage as per regulations. Failing to store cannabis correctly could not only degrade its quality but also put you at odds with compliance under the ACMPR license. By following this guide, you can preserve the quality, potency, and safety of your medical cannabis, ensuring that you get the therapeutic benefits you require whenever you need them.