At what soil temperature is the soil too hot for plant life? If applying an organic mulch such as compost, at what temperature (of the mulch) does that mulch become dangerous to plant life (such as grass that is growing next to the application of mulch)? For example, if I put down compost in my landscape beds as a mulch and that mulch is hot, is there a certain temperature range where it becomes dangerous to those plants?
Marion County Oregon
I understand that plants have different needs. Here in Marion County, if we are referring to native species, what temperature would you say is too hot for plant health? A soil temperature of 95 or hotter? Is there any data that shows what temperature is too hot? I haven’t been able to find any.
We have had multiple cases this year where applying mulch has fried customers grass along edges of beds. We took the temperature of it and our bark dust was at 120 degrees. Would that be considered too hot to apply near plants? From your response, it sounds like not.