My 30 year old, 20 foot tall outdoor Ficus drops fruit or seeds (pea size tan nut-like balls) in the summer.
Is there any way to stop the production of these messy balls?
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Not really, the little balls are unfertilized fruit. From here:
The fig fruit is an enclosed inflorescence, sometimes referred to as a syconium, an urn-like structure lined on the inside with the fig's tiny flowers. The unique fig pollination system, involving tiny, highly specific wasps, known as fig wasps that enter via ostiole these sub-closed inflorescences to both pollinate and lay their own eggs
Regardless of whether those tiny wasps live near your tree you will get the little fruit.
If you can find someone who:
then you might be able to reduce the fruit production to minimal levels.
Inject Atrimmec into the tree before it starts to bloom in Summer.