For the record, here are weight tax rates for cannabis in U.S. states as far as I know. I’m preserving the documents here, since the rates will change.
California adjusts its marijuana tax rates for inflation. Here is a copy of the rates as of early 2020.
Flower, $9.65 per ounce; leaves, $2.87 per ounce; and fresh cannabis plant, $1.35 per ounce. New categories can be created by regulation as needed.
 https://www.cdtfa.ca.gov/industry/cannabis.htm#Overview; copied at https://newrevenue.org/2020/02/19/california-marijuana-tax-rates-as-of-january-2020/.
2020 January Tax Guide for Cannabis Businesses
Here are Alaska’s rates, from http://tax.alaska.gov/programs/programs/help/faq/faq.aspx?60000, Average Market Rate for Unprocessed Retail Marijuana | Department of Revenue – Taxation:
“Effective January 1, 2019, sales and transfers of marijuana are subject to new tax rates. Mature bud/flower are taxed at $50 per ounces and trim is taxed at $15 per ounce. A new rate has been added at $25 per ounces for bud/flower that is considered immature or abnormal. This is bud/flower that did not fully mature or develop, contains seeds, or failed testing. Clones are taxed at a flat rate of $1 per clone and not on the estimated weight.”
Here are Maine’s rates, from https://legislature.maine.gov/statutes/36/title36sec4923.html:
(Title 36, §4923: Excise tax imposed has a copy.)
Here are Nevada’s, with fair market value to be multiplied by 15 percent:
As of 1-1-2019:
Click to access Marijuana-Fair-Market-Value-Jan-1-2019.pdf
Here are newer rates: https://tax.nv.gov/uploadedFiles/taxnvgov/Content/Home/Features/Fair%20Market%20Value%20at%20Wholesale%20Summary%20Jan%2020%20(Final%20Draft).pdf
Fair Market Value at Wholesale Summary Jan 20 (Final Draft).
Here are Colorado’s — 15 percent of the numbers below:
Average Market Rate for Unprocessed Retail Marijuana | Department of Revenue – Taxation
Period Rate: January 1 to March 31, 2020
| Retail Bud Rate
|| $1,316 per pound
| Retail Trim Rate
|| $350 per pound
| Retail Immature Plant Rate
|| $9 per plant
| Wet Whole Plant Rate
|| $191 per pound
| Seed Rate
|| $5 per seed
| Trim Allocated for Extraction Rate
|| $247 per pound
| Bud Allocated for Extraction Rate
|| $299 per pound