Short answer
Purchase limits for cannabis are set by state law, not by one national rule. If you buy hemp-derived CBD online, the federal cap that matters is 0.3 percent delta-9 THC by dry weight. If you buy marijuana at a dispensary, your state sets a cap per transaction or per day, commonly 1 ounce of flower for recreational customers, with separate caps for concentrates and edibles.
Cannabis Purchase Limits: CBD and Dispensary Buying Guide
Federal rules for hemp and CBD
The 2018 Farm Bill removed hemp from the Controlled Substances Act and defined it as cannabis with no more than 0.3 percent delta-9 THC on a dry weight basis. USDA hemp program rules use the same threshold for crops. A CBD product that tests within the federal limit is not subject to the state purchase caps described below. Products above that line are treated as marijuana.
Some states have added their own limits on hemp-derived intoxicating cannabinoids such as delta-8 THC. These rules often restrict sales to licensed cannabis stores or ban the products, so check your state before ordering.
what are the cannabis purchase limits in my state
State purchase limits for marijuana
Recreational states typically cap a single transaction or a single day:
how many cannabis products can you buy at once at a dispensary
- California: 28.5 grams of flower and 8 grams of concentrate per day for adults 21 and older.
- Colorado: 1 ounce of flower per transaction for recreational buyers, 2 ounces for medical patients.
- Washington: 1 ounce of flower, 7 grams of concentrate, and set edible limits per transaction.
- Oregon: 1 ounce of flower per retail sale, with lower caps on concentrates.
Numbers change often. A limit written as one ounce equals about 28 grams, so some stores sell single items at or just under that weight.
Medical versus recreational
Medical patients usually get a higher ceiling than recreational customers in the same state, plus lower taxes. Florida, for example, allows medical cannabis only and tracks purchases over a rolling 35 day window rather than a single visit. Bring your state card or recommendation if you want the medical limit.
Per transaction versus per day
Some states require stores to log sales in a traceability system, which prevents a customer from splitting one day of allowance across several shops. Other states enforce the cap only at the register. Know which system your state uses before you plan a larger purchase.
Product type matters
Flower, concentrate, and edibles rarely share one number. A common pattern is 1 ounce of flower, 8 grams of concentrate, and 100 mg of THC per edible package. Read the label for total THC, not just net weight.
How to check the limit in your state
Prerequisites: your state cannabis regulator website and a valid ID showing you are 21 or older (18 or 21 with a medical card, depending on state).
- Search for your state cannabis control board or department of revenue page.
- Open the section labeled purchase limits, possession limits, or retail sales limits.
- Match the cap to the product type you plan to buy.
- Confirm the age and ID rules for the store or delivery service.
- Ask the retailer to confirm the current cap if the page looks outdated.
What this means for CBD shoppers
Most lab-tested CBD sold online falls under the hemp threshold, so it does not count against marijuana purchase limits. Check the certificate of analysis for total delta-9 THC before you buy, and confirm your state rules on delta-8 and similar compounds. If a product sits above 0.3 percent THC, treat it like marijuana and follow the state cap.