Cannabis Cultivation Guides

Plant growth regulators (PGRs) are natural or synthetic substances that change plant hormone activity to manipulate growth, development, and flowering. In cannabis cultivation, PGRs are used commercially…

Knowing how to get rid of leaf miners on cannabis starts with confirming the damage: check leaves for see-through tunnels that widen from one end, often with a dark line of droppings. Then pinch each tunnel…

Hop latent viroid (HLVd) is a tiny strand of infectious RNA that causes dudding disease in cannabis. Infected plants and clones show severely stunted growth and shrunken buds with diminished yields and…

The best cannabis pH level for soil is 6.0–6.3 (5.5–6.5 acceptable) and 5.8–6.2 (5.6–6.4 acceptable) for coco coir and hydroponic setups. Keep root zone pH inside those windows and your plants can take…

The Sea of Green method takes lots of small cannabis plants, flips them to flower after a quick veg, and lets each one finish with a single cola. Most growers call it SOG for short, and it's one of the…

To clone marijuana, cut a 4–6 inch shoot from a healthy female plant in veg, just below a node. Strip the lower leaves, dip the base in rooting hormone, and set it in a damp medium under a humidity dome…

Flushing cannabis is about switching to plain, pH-adjusted water in late flower instead of nutrient solution. Count back from your expected harvest date so the flush wraps up as the trichomes turn mostly…

White mold on plants is likely powdery mildew on cannabis — a fungus that leaves dusty white to pale-gray patches on leaves. Confirm it by wiping a patch, then remove infected leaves, improve airflow and…

Cannabis foxtailing is when buds grow upward instead of filling out, pushing narrow, spiky towers of new calyxes off the top of a cola until it looks like a cluster of fingers or a fox’s tail. It has three…

New leaves with dark bluish purple tones, bright yellowing tips, and a metallic-looking sheen are classic symptoms of copper deficiency in cannabis. It looks alarming, though it’s actually quite uncommon…

A cannabis boron deficiency shows up in the newest growth first, twisting the tips and dotting young leaves with brown or yellow spots, often with brittle stems. It stays rare, because most tap water and…

Zinc deficiency in cannabis shows up as yellowing new leaves, paired with shrinking, twisted blades, and tightly bunched nodes. Left uncorrected, it stunts plant growth, leading to deformed buds that lack…

Cannabis manganese deficiency shows up first on the newest top growth as yellowing between the veins, dotted with small brown or tan spots. In most grows the manganese is already in the medium, the plant…

Yellowing on the middle of the plant with strange red, pink or orange edges is the classic tell of a molybdenum deficiency in cannabis. It looks a lot like a nitrogen problem at first glance, which is…

Few things worry a grower like a plant that suddenly starts yellowing up top. Cannabis iron deficiency is a frequent culprit, though it tends to look worse than it really is. The fix is usually simple…

A cannabis magnesium deficiency starves leaves of the chlorophyll they need to turn light into energy. Left unchecked, it stunts growth, kills off lower leaves and shrinks your final harvest. It hits hardest…

Yellow leaves on your cannabis plant don't always mean nitrogen trouble. A sulfur deficiency in cannabis causes the same pale color, but starts near the leaflet base. It's rare, but worth ruling out if…

If your weed leaves have turned dark green, glossy and started curling downward like little claws, you're probably dealing with nitrogen toxicity. It's one of the most common feeding mistakes growers make…