Buying Koosa Seeds

Koosa is a general term for squash in some Arabic dialects, but it most commonly refers to a type of cream colored summer squash grown in Lebanon called Lebanese white marrow or white bush squash. This type of squash is typically only found in the Middle East, so you have to grow them yourself if you want it and don't live there.

Looking online, I found a few seed sellers who sell Lebanese white marrow:

• Reiner Seeds
  
• Baker Creek Heirloom Seeds

I have not purchased from these retailers, so I can not recommend one over the other.