When properly watered, the perlite retains air inside it's tiny pockets, preventing over-saturation of the media.
When overwatered, the perlite displaces the air with water, which will keep the media saturated for longer.

Do not let the pots sit in standing water, even if you do have drainage rocks. (or perlite) It will prevent the air circulation (through the soil) that the plant needs.
Rusty Trichome Reviewed by Rusty Trichome on . Emmies Grow Log - White Widow Grow Log (pics coming when I get the ability to post them) 12/06 - Started germination 12/09 - 10 5/5 seeds germinated and transplanted to 6? pots. Light set to 24/0. Light is bare minimum at this point, 4? shop light with standard grow bulbs from hardware store. Ordered $500 of new lights online. 12/13 ?? got programmable thermostat and light timer today, now set to 77° day, 70° night. Also set light timer for 18/6 and added a fan to the closet to evenly distribute heat Rating: 5