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Here’s the finger technique for watering. We found this very helpful. Stick your finger into the soil up to your first knuckle. If the soil is dry in the first inch to inch-and-half, water. (This applies to medium sized containers and above. Sticking your finger in a small pot may damage the roots).

The ideal pH for marijuana ranges from about 5.5-7 depending on growing medium. pH is the rating for how acidic or not something is. This affects your water, soil and plants. If the pH is too high or too low, your plants will have trouble taking in nutrients. The pH of water in Humboldt County is 6.1. 

You may have seen three numbers on the label of fertilizers and nutrients at your local grow store. Well, they stand for Nitrogen, Phosphorus, and Potassium, respectively. The number shows the percentage of each element contained in the fertilizer.
A solution high in Nitrogen is most commonly used for the vegetative phase (pre-bloom) of your plants. Phosphorus is good for flowering. It is involved in several key plant functions, including energy transfer and photosynthesis. Potassium (considered second only to nitrogen), promotes disease resistance and helps strengthen plant tissue. Potassium is pretty much used throughout a plant's full life cycle, both vegetative and flowering.

Although high levels of phosphorus are commonly used to bloom cannabis plants, too much phosphorus can hurt the growth of soil organisms called mycorrhizal fungi. A mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant's root system. Mycorrhizae (pl.) play important roles in plant nutrition, soil biology and soil chemistry. The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus, and the fungus supplies to the plant water and mineral nutrients taken from the soil. So basically, if you see mycorrhizae on the label of soil... buy it.

If left to grow on its own, a cannabis plant will grow vertically, focusing its energy on one main stalk. The result is one long dominant cola with smaller stalks surrounding it. These smaller stalks will produce small buds that won’t be that good and the overall size and yield of the plant will be small.

Topping makes a cannabis plant bushier—by cutting off the main stalk, the plant will redirect its energies to the smaller side branches, which will grow out and produce bigger buds.

• LEDs (light-emitting diodes) create light when an electric current — a flow of electrons — passes through a special material called a semiconductor. NASA pioneered the use of LEDs for growing plants as a result of their research on the best lighting technology to produce edible crops in space. LEDs are the most energy-efficient type of grow light. This means they can provide the most light compared to their running costs. (amount of light generated vs. watts needed) Because of this, another advantage of LED lights is that they run much cooler compared to HID lighting - barely producing any heat at all, making them ideal for grow tents especially in the warmer seasons, or when ventilation is an issue.

• HID GROW LIGHTS (MH & HPS) HID (High-intensity Discharge) grow lights are somewhat of a golden standard in the cannabis growing industry. Many growers swear by HID lighting and believe that they give the best and biggest yields. There are two main types of HID lights, MH (Metal Halide) lights and HPS (High Pressure Sodium) lights. The difference between the two is that MH lights give a “cooler”, blueish light whereas HPS lights sit at the red end of the spectrum. This makes MH lights better suitable for the vegetative phase of your plants and HPS better for flowering.