Can we talk about how much water a mature oak actually pulls from the ground in a single day?

I was reading through some old ISA research papers a buddy sent over and stumbled on a stat that blew my mind. A single mature oak can pull over 100 gallons of water from the soil in one day during peak growing season. That's more than most of us use in a shower for a whole week. It made me rethink how I approach watering plans on new plantings near established oaks. Has anyone else seen numbers like that and adjusted their setup?

3 comments

3 Comments

brian_hart16h ago

Yeah that "over 100 gallons" stat really hit me too when I first saw it. I had to double check the math because it just sounds insane but it checks out with how much leaf surface those trees push. I ended up putting a 10 foot buffer zone around my oak plantings where I just let the soil dry out naturally between rains instead of running irrigation near them. Really changed how I look at competition for moisture between established canopy and new stuff.

juliaa6513h ago

So basically my oaks are drinking more than I do on a hot Saturday?

the_elizabeth10h ago

@brian_hart and I are just jealous our weekend booze intake doesn't hit triple digits.