Stephen Keen

Stephen Keen has been an indoor gardening hobbyist for more than 10 years. His personal successes with his garden led him to want to bring new ideas, mainly water-cooling, to the mainstream, which led to the founding of Hydro Innovations.

Articles by Stephen Keen


The Weakest Links: Why Cannabis Growers Should Be Culling Their Weaker Plants The Weakest Links: Why Cannabis Growers Should Be Culling Their Weaker Plants The Weakest Links: Why Cannabis Growers Should Be Culling Their Weaker Plants The Weakest Links: Why Cannabis Growers Should Be Culling Their Weaker Plants


Focus on the best and forget the rest. To build a strong crop of healthy plants, don’t be afraid to cull the weakest plants at each stage.

Try This Highly Recommended Cannabis Lighting Schedule Try This Highly Recommended Cannabis Lighting Schedule Try This Highly Recommended Cannabis Lighting Schedule Try This Highly Recommended Cannabis Lighting Schedule


The key factor in growing cannabis is not the light periods; it’s the dark periods. Surna’s Stephen Keen weighs in with his preferred light...

How to Reduce Your Grow Room's Operational Costs How to Reduce Your Grow Room's Operational Costs How to Reduce Your Grow Room's Operational Costs How to Reduce Your Grow Room's Operational Costs


Save time and money while growing marijuana with these growroom efficiency tips from expert growers.

6 Myths About Cooling Your Cannabis Grow Room 6 Myths About Cooling Your Cannabis Grow Room 6 Myths About Cooling Your Cannabis Grow Room 6 Myths About Cooling Your Cannabis Grow Room


There are a lot of myths that surround the cooling needs in the cannabis industry. Surna/Hydro Innovation’s Stephen Keen delves into some...

How Your Cannabis Plants Respond to Stress, the Good and the Bad How Your Cannabis Plants Respond to Stress, the Good and the Bad How Your Cannabis Plants Respond to Stress, the Good and the Bad How Your Cannabis Plants Respond to Stress, the Good and the Bad


The phrase ‘What doesn’t kill you makes you stronger’ can also apply to your plants. By providing ‘good’ stress to your crop, you can...

Surna-Keen_Vapor-Pressure-Deficit Surna-Keen_Vapor-Pressure-Deficit Surna-Keen_Vapor-Pressure-Deficit Surna-Keen_Vapor-Pressure-Deficit


Growers know that vapor pressure deficit is important for healthy plants but requires strict attention to detail and equipment that can...

Bringing in a Bumper Crop: CO2 in the Garden Bringing in a Bumper Crop: CO2 in the Garden Bringing in a Bumper Crop: CO2 in the Garden Bringing in a Bumper Crop: CO2 in the Garden


One important, and often overlooked, aspect of an indoor garden's climate is the level of carbon dioxide present. Here is why this is so...

Total Control: Choosing the Right Cooling System Total Control: Choosing the Right Cooling System Total Control: Choosing the Right Cooling System Total Control: Choosing the Right Cooling System


There are all kinds of options available to you when choosing the ideal cooling system for your garden—the tricky part is balancing upfront...

Creative Control: Out-of-the-Box Cooling Solutions for Your Summer Garden Creative Control: Out-of-the-Box Cooling Solutions for Your Summer Garden Creative Control: Out-of-the-Box Cooling Solutions for Your Summer Garden Creative Control: Out-of-the-Box Cooling Solutions for Your Summer Garden


There isn’t always just one solution to every problem. Given a little ingenuity, even the big ones—like dealing with excessive summer...

In Control: A Guide to Achieving the Perfect Indoor Climate In Control: A Guide to Achieving the Perfect Indoor Climate In Control: A Guide to Achieving the Perfect Indoor Climate In Control: A Guide to Achieving the Perfect Indoor Climate


Does it seem like you’ll never achieve your ideal harvest? If you consider all the climatic factors, it might finally be within your reach.

Q&A by Stephen Keen


My mother plant grow chamber has an oscillating fan. It is a little cold; is there anything else I need? My mother plant grow chamber has an oscillating fan. It is a little cold; is there anything else I need? My mother plant grow chamber has an oscillating fan. It is a little cold; is there anything else I need? My mother plant grow chamber has an oscillating fan. It is a little cold; is there anything else I need?


If you’re using a small intake fan for cooling your mother chamber and it’s a little cold in there, try putting your intake and exhaust...

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