I have an 18-20 year old Yatsubusa Black Pine in an 8" pot that I’d like to repot this season (it’s been in its current pot for approx. two years).
Can you recommend a pot size to move up to as well as the proper soil mixture to purchase? The tree is approx. 13" tall now.
Lastly, the tree is in San Mateo, CA in the San Francisco Bay Area - when is an optimal time of year to begin repotting?