Quote:
Originally Posted by Fran20
How large is the diameter of scoria pieces that you use at the bottom of the pot?
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Hi Fran. For large mature catts, I just use scoria having minimum of roughly 10 mm diameter and up to say 15 mm. The bag of scoria I buy is really like a mixture. Some pieces could even be larger than 15 mm.
If you're happy that the scoria pieces will have a good chance of providing a satisfactory path for air to flow among and around the filled pot (of scoria), then that's the main aim. It's mainly for my smaller sized plants that I put in bigger pots - where I might put some large size scoria pieces to create a thick enough bottom layer - to prevent drainage holes getting blocked, and also to prevent having all small-sized (eg. 5 mm diameter) scoria in a relatively big pot ----- as I noticed that thick layers of relatively small diameter scoria rocks can result in a slurry mix ..... very watery --- that could just stay like that too long in the pot, and suffocate roots.
Usually - if there's no need to have different sized scoria for different layers, then that's great - and convenient. But sometimes - if you feel that something could help avoid some unwanted conditions, and it makes sense to change things up a little - then that's great, especially if it appears to be workable and effective.
DC appears to be doing something similar too sometimes, like having bigger sized pieces to create a bottom layer for assisting air-flow, or preventing a slurry condition in the pot.