sorry if there's already a topic about this but i was wondering when it opened.

is it random? or is there a set time?

There's a thread in General Discussion about this. I think it's 8-9 AM and 8-9 PM is when it's opened... I'd go double check though. :P [edit]

PEKA GLADE IS OPEN AT:

8:00AM - 8:59AM Subeta Time
AND
8:00PM - 8:59PM Subeta Time

Glade PotionOrnate Floral Pitcher

To get a Glade Potion, have an ornate floral pitcher in your inventory, and visit PEKA GLADE, at one of the designated times above. 

yupp