Bonsai Study Group Forum

General Category => General Bonsai Discussion => Topic started by: BonsaiEngineer1493 on November 27, 2014, 12:30 PM

Title: White Growth On Soil
Post by: BonsaiEngineer1493 on November 27, 2014, 12:30 PM
Happy Thanksgiving everyone!

I decided to check what plants need water today. My little guys I placed in a small miniature cold frame. As soon as I pulled out my trident maple, I noticed small cotton type of growth has formed on top of the soil. Are you guys familiar with this? My mositure meter usually reads high humidity in the cold frame -maybe that helps.

Thanks,

Nick
Title: Re: White Growth On Soil
Post by: DorianJF on November 28, 2014, 11:57 AM
hi Nick

Happy Thanksgiving to you.

Sorry never seen anything like that before.

Maybe this helps?

http://homeguides.sfgate.com/rid-mold-plant-soil-49070.html (http://homeguides.sfgate.com/rid-mold-plant-soil-49070.html)
Title: Re: White Growth On Soil
Post by: coh on November 28, 2014, 04:35 PM
Do you have a fertilizer remnants or a high amount of organic material in the soil (or on the surface)? That kind of stuff can often get mold especially if it's damp and there isn't enough ventilation...like in a small cold frame.
Title: Re: White Growth On Soil
Post by: Judy on November 28, 2014, 09:05 PM
It happens on that type  of pelleted fert as it breaks down even outside where ventilation is good. Nothing to be concerned about.  If you are into storage mode, you may want to just scrape off the very top layer of soil and replace it to clean it all up for the winter. 
Title: Re: White Growth On Soil
Post by: Adair M on November 29, 2014, 09:20 AM
Judy:  you are right on!

Boon calls this "Soji".  In fall, scrape off the top 1/2 to 3/4 inch of soil, and replace it with fresh bonsai soil. He does this with any bonsai he does not plan to repot in the spring.