I got tired of being on the lookout for decent sources of gathering data, so I made my own.
The following is a Google Spreadsheet with all you could care to know about Botany yields. Each zone has its own spreadsheet, because... well, why would you ever need more than one zone's information at once? The first page is a full list of every item you can obtain through Botany.
You'll find data such as:
• Exactly where items can be found
• NPC values for items
• Maximum yields per gather
• Which market ward each item can be found in
• Initial remainder bar
• Favored notch
• Where to chop
• Tips about logging for each zone
• Miscellaneous notes about items
• Shrub locations and tree count per zone
Cheers. Feel free to ask questions or inform me of errors.
Please do not inform me of errors you found during a guildleve. Guildleve loot tables still contain pre-1.21 data in them, so the guildleves may not match my zone data. If you go to the main page of the spreadsheet and scroll to the right, you can get the info needed for any item, regardless of zone if you need it during a guildleve.