'Sister Wives' Fans Donate Thousands to Cat Orgs in Garrison Brown's Honor

Garrison Brown's legacy as a cat dad will never be forgotten, as "Sister Wives" fans give buckets of money to the cause near and dear to the late TLC personality ... TMZ has learned.

Liz Olson of High Country Humane tells TMZ ... people from all over the world have donated to the animal shelter in the week since Garrison died by suicide. The cat org received donations totaling more than $13K ... and counting!

She confirms she's the one who alerted Garrison's mother, Janelle Brown, to the outpouring of support ... and then, Janelle shared her emotional reaction this week to that uplifting news.

Garrison and High Country Humane knew each other well -- Liz tells us he adopted 3 of his cats -- including new addition Ms. Buttons -- from the shelter in the last 2 years.

In response to the generosity displayed by Garrison's followers, HCH has launched an initiative in his name that will help cats get adopted throughout the month of March.

Specifically, the money will cover adoption fees for any of the cats rescued during this effort.

The tributes don't stop there ... Liz tells us the org also plans to rename its cat adoption room in his honor. There will be a plaque unveiling and everything at their 5-year anniversary celebration this month.

Ark Cat Sanctuary is also getting monetary support after Garrison's passing. Cat Roberts, yes that's really her name, tells TMZ ... the org's  received more than $500 in donations from people all over the globe, including some in Australia and Scotland.

Cat believes the support from Garrison's fans will help them stay open this year ... after receiving $30K less in grant money for 2024. She says the biggest help has been people purchasing items like wet food and kitten milk replacement from the sanctuary's Amazon wish list.

It's a small silver lining on an otherwise tragic story.