Q.Perlite
Is perlite safe for lime-hating plants; for example, Rhododendrons?

Downtoearthdigs
Answered on May 9, 2016
Perlite can be used in planting mediums for Rhododendrons and Azaleas.
Some growers prefer to use composted bark or conifer needles to amend the soil.
Perlite is great to ensure good drainage.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/perlite-potting-soil.htm
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