A QP is a quarter pound: 4 oz, about 113 g of dried flower. It is a common unit in grower talk for a strong single-plant yield.
In practice
"A QP off one plant" is a good result indoors. The founder of GenetixBay has pulled a QP+ (4 oz+) from a plant in a 16 oz cup, which shows that root volume is not the whole story: with high-frequency fertigation, nutrients and water reach the roots often enough that a small container can support a large plant. Bigger pots still generally mean bigger yields, within reason; pot size is a trade-off against how often you feed.
Possession and transport limits are usually far below a QP for unlicensed people. Check local rules.
Units and formula
| Slang | Nominal weight | Metric |
|---|---|---|
| Gram | 1 g | 1 g |
| Eighth | 1/8 oz | 3.5 g (exact: 3.54 g) |
| Quarter | 1/4 oz | 7 g |
| Half | 1/2 oz | 14 g |
| Ounce (zip, O) | 1 oz | 28 g (exact: 28.35 g) |
| QP | 1/4 lb (4 oz) | 113 g |
| Pound (elbow, LB) | 1 lb (16 oz) | 454 g (exact: 453.6 g) |
Retail rounds an eighth to 3.5 g and an ounce to 28 g.
Don't confuse with
- Quarter: a quarter ounce, 7 g. "Quarter" alone usually means this, not a QP.
Pot size is the volume of medium a plant roots into; bigger pots give bigger plants within reason, but feeding frequency can let small pots punch well above their size.High-frequency fertigation feeds small volumes of nutrient solution many times a day, keeping the root zone consistently moist and fed so small pots can produce large plants.Yield is the dry weight of usable flower harvested, usually expressed per plant, per square metre of canopy (g/m²) or per watt of light (g/W).An ounce of cannabis is 28.35 grams, rounded to 28 g in retail; slang includes zip, O and onion.Elbow is slang for a pound of cannabis, 16 ounces or about 454 grams, from the spoken abbreviation "L-B".A gram (g) is the base metric unit for weighing cannabis flower and concentrates; 28 g make a retail ounce and 3.5 g an eighth.
