How to Use SM-90 for Cannabis Growing

Navigating the complexities of cannabis cultivation requires not just a passion but also a deep understanding of the tools and products that can enhance plant health and yield. Among these, the SM-90 stands out as a product revered for its versatility and effectiveness.

Sm 90

What is SM-90?

At its core, SM-90 is a wetting agent formulated to improve the health and resilience of plants. It serves multiple purposes in cannabis cultivation, from enhancing nutrient uptake to combating fungal and bacterial pathogens. Its composition, designed to support plant vitality, underscores its popularity in the cannabis community.

However, its utility extends beyond just a plant health enhancer; it has been noted for its role in pest management and disease prevention, making it a staple in many growers’ arsenals.

The Benefits of SM-90

The application of SM-90 in cannabis cultivation offers a broad spectrum of benefits. It bolsters root health, enabling robust growth and nutrient absorption. This foundational strength is crucial in mitigating common root diseases and pests that can compromise plant health.

Furthermore, SM-90’s impact extends to the aerial parts of the plant, with reports of improved resistance to pests and diseases. However, its efficacy can vary based on specific conditions and application methods.

Weed Over-Watering

Application Techniques of SM-90

The application of SM-90 in cannabis cultivation requires a nuanced understanding of both the product and the plants it’s being used on. To harness the full potential of SM-90, here are detailed guidelines, including dilution ratios, application methods, and timing considerations:

Dilution Ratios

  • For Root Health: Mix 1 part SM-90 with 5 parts water for the nutrient solution. This concentration helps promote healthy root development and prevents root diseases.
  • For Foliar Spray (Pest Control): Dilute 1 part SM-90 with 10 parts water. Apply this solution as a foliar spray to target pests without harming the plant.

Application Methods

  • Nutrient Solution Integration: Add the diluted SM-90 solution directly to your hydroponic reservoir or watering can for soil growth. This method ensures systemic absorption, benefiting the entire plant.
  • Foliar Spraying: Use a spray bottle to apply the diluted foliar solution directly onto the leaves. Ensure coverage on the top and underside of leaves for maximum pest control efficacy.

Timing and Frequency

  • Preventive Applications: For general health maintenance, apply SM-90 to the nutrient solution every two weeks. For foliar applications, once every two to three weeks can deter pests.
  • Active Issues: If dealing with an active infestation or disease, foliar applications may be increased to once per week until the issue is resolved. Monitor plants closely for signs of stress.

Best Practices

  • Avoid Overapplication: More is not always better. Stick to recommended dilution ratios and frequencies to avoid phytotoxicity or nutrient imbalances.
  • Use at Lights Off: For foliar applications, spray in the evening or when lights are off in indoor setups to prevent burning the leaves.
  • Consistent Monitoring: Regularly check your plants for signs of pests, diseases, or stress. Early detection is key to effective treatment with SM-90.

Common Pitfalls

  • Ignoring Environmental Factors: Ensure your growing environment (humidity, temperature, airflow) is optimized alongside using SM-90, as it enhances but cannot replace good cultivation practices.
  • Misidentifying Problems: Accurately diagnose plant health issues before treating with SM-90. Incorrect use can exacerbate issues or be ineffective against certain pests or diseases.

By adhering to these guidelines, growers can optimize the use of SM-90 in their cannabis cultivation practices, ensuring healthier plants and more bountiful harvests.

Alternatives to SM-90

While SM-90 is a popular choice for cannabis cultivation, there are several effective alternatives for growers facing regulatory challenges or seeking different solutions:

  • Neem Oil: A natural pest repellent and disease preventer, ideal for organic gardening.
  • Hydrogen Peroxide: Useful for oxygenating water and combating root rot and pathogens.
  • Essential Oils: Such as peppermint and rosemary, offer natural pest control without harsh chemicals.
  • Insecticidal Soaps: Target a wide range of insects safely throughout the plant’s growth.
  • Beneficial Microbes: Enhance nutrient uptake and protect against pathogens.
  • Diatomaceous Earth: Provides mechanical pest control through physical means, safe for use around plants.

These alternatives can be tailored to fit specific cultivation needs, ensuring healthy plants and successful harvests without reliance on SM-90.


SM-90 represents a confluence of innovation and tradition in cannabis cultivation, offering growers a tool to enhance plant health and yield. However, its effective use requires a blend of knowledge, skill, and awareness of the regulatory environment. As the cannabis industry continues to evolve, so too will the tools and techniques at the disposal of cultivators.


Can SM-90 be used in organic cannabis cultivation?

Yes, SM-90 can be integrated into organic cannabis cultivation practices. However, growers should ensure its use aligns with the specific organic certifications they aim to maintain, as regulations may vary.

How often should SM-90 be applied to prevent diseases and pests?

The frequency of SM-90 application can vary depending on your cultivation environment and your specific challenges. Applying SM-90 every two weeks as a preventive measure can help maintain plant health. For active issues, consult the product guidelines and consider more frequent applications until the problem is under control.

Can SM-90 be mixed with other nutrients or pesticides?

SM-90 is generally compatible with many nutrients and some organic pesticides. However, performing a small-scale compatibility test before mixing it with other products is essential to avoid adverse reactions that could harm your plants.

Does SM-90 affect the taste or aroma of cannabis?

When used as directed and properly flushed from the plants before harvest, SM-90 should not adversely affect the taste or aroma of cannabis. Proper application ensures that the benefits of SM-90 are realized without impacting the final product’s quality.

Is it safe to use SM-90 during flowering?

SM-90 can be used during the flowering stage, but it’s crucial to apply it cautiously to avoid contact with buds. Using SM-90 as a foliar spray on the leaves rather than directly on the flowers can help prevent potential issues with taste or aroma.

What are some signs that my plants may need SM-90?

Signs that your cannabis plants might benefit from SM-90 include yellowing leaves, stunted growth, or the presence of pests like spider mites. If the roots appear brown or slimy, SM-90 might help address these root health issues.

Can SM-90 help with water retention in soil or hydroponic systems?

While SM-90 is not specifically designed to enhance water retention, its wetting agent properties can improve water distribution and nutrient uptake in soil and hydroponic systems. This can lead to more efficient water use and potentially better moisture retention around the roots.

Alex Ramsey

Alex Ramsey

Cannabis Industry Copywriting Specialist

He combines a deep understanding of cannabis with a passion for crafting engaging content. With a focus on demystifying cannabis through education, Alex contributes to the industry’s growth with content that sells, educates, and engages the community.

Learn more about 420 Ergonomics, our team.

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