Noticed it was missing from Item DB.
Legendary greenfingers aura
Examine: Prevents crops from disease, whilst active, and grants a chance to harvest more crops.
Weight: 0.00 kg
High/Low alchemy: N/A
Tier 5 aura.
Upgraded from Supreme greenfingers aura for 119,000 Loyalty Points.
Provides a 15% chance of increased crop yields.
Active for 20 minutes with 1 Hour cooldown.
Edit: Forgot to check the combat stats, but seeing as the others don't provide any...