Proper Marijuana Seeds Drying Marijuana seeds should be dried in a climate-controlled environment using fan ventilation. Seeds should never be dried in the sun nor anywhere the temperature exceeds 95oF (35oC). Remember, dark colored seeds absorb more of the suns rays and are especially vulnerable to sun/heat damage. A ceiling fan and air conditioner will dry seeds safely and very quickly. Spread seeds out on a window screen or plywood, never use cardboard, newspaper or any other paper product. Seeds will stick to paper products and can damage the seed when unstuck. Use a hard, non-stick surface. Never spread marijuana seeds thicker than ¼” thick. Be sure to stir them 3 times per day. I like to stir them while drinking my morning coffee, just before sitting down for supper and before bed after brushing my teeth.