Now that the UMBR-MATIC farm is live on the Polygon ecosystem you can farm your UMBR here where it will be much, much cheaper to enter/exit the farm and harvest. Of course you’ll also be earning additional UMBR and MATIC for providing liquidity in the UMBR-MATIC pool.
The UMBR-MATIC farm currently has an APY of 268%. Tokens are minted per block which is every two seconds on Polygon: 0.03 UMBR per block. The team is hopeful that this will remain one of the highest APY farms on Polygon.

more information https://umbrianetwork.medium.com/rewards-halving-on-umbr-eth-farm-823fe02f32d8

don't forget to read about How To Earn UMBR on the Umbria Farm

The Umbria team have just announced the release of the Umbria Exchange and Umbria Farm on the polygon ecosystem. Users can now earn interest on their cryptocurrency holdings, and enjoy a high APY return on their investments.
There are some prerequisite steps to using the Umbria Farm. Firstly, you must move your cryptocurrency assets to the Polygon chain. Follow these steps to move your tokens to the Polygon ecosystem. Secondly, you must provide Umbria (UMBR) and Polygon (MATIC) liquidity to the Umbria Exchange, you can find out how to do this here. Once you have done these two steps, you will receive UMBR-MATIC LP tokens in your Metamask wallet. You can deposit these LP tokens into the Umbria Farm to earn Umbria every block.

read more https://umbrianetwork.medium.com/how-to-earn-umbria-on-the-umbria-farm-d030ed543203