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Compost Input - Spent Potting Soil?

 
master gardener
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Location: Upstate NY, Zone 5, 43 inch Avg. Rainfall
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Good Morning Permies!

I am looking for your thoughts on utilizing spent potting soil. I have a LOT of house plants and I start plants in the winter months for spring planting. I produce my own potting mix (Coir/Leaf Mould based) and my fiancé will purchase specialty mixes for plants with unique requirements (Carnivores, Succulents, Cacti... ect ect)

Some will have perlite, some will have vermiculite, others will have grit.

All in all, I end up putting all of this in my compost stream in small amounts. I still have about 15-20 gallons of spent material from dieback, residual from planting starts, and from purchased plants that have been up-potted. I don't want to add too much as once and god forbid buffer the composting process.

I have not had any perceived negative effects, but I was wondering what other people do.

Does it go in the compost? Do you 'rejuvenate' the soil and reuse it? What do you do?
 
gardener
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I mix it in with my spent bokashi, which needs to age a few weeks mixed half-and-half with dirt before I can use it like finished compost (and at that point, I may mix it with spent dirt and use it to fill new planters.
Occasionally I'll have a big lot of compostables that would fill the whole bokashi bucket, and instead I'll just dig a trench in the garden and throw the spent soil on top of it along with what was in the trench. My soil here is clay, so whatever is not clay is helping.
 
pollinator
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I mix mine in my compost with no issues.
 
pollinator
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That's what I've done for years. It goes back into a hot compost pile, and then in the spring the compost goes back into potting soil.
 
master pollinator
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In fall, we dump out our flower pots on a pile. I chop out the heavy roots but leave the fine rootlets. In spring, we mix a bunch of finished compost and a little inoculated biochar, and then refill the flower pots. Works fine.
 
master steward
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Like others, I toss mine on my compost pile.  Never a problem.  With the system I use, the compost cooks for about 3 years.
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