Which Plastics Are Safe For Gardening?
www.epicgardening.com
One of the more common questions I'm asked on the blog is about plastic use, specifically, "What plastics are safe for use in the garden?"  Since

When it comes to plastics, the saying goes: 4, 5, 1, 2, all the rest are bad for you.

However, #1 (PET) is not ideal since it’s often thin and intended for single use (think plastic water bottles) . Hence, it breaks down quicker and may pose a risk of leaching.

Consider re-using these for your gardens.
#4 - LDPE
#5 - PP
#2 - HDPE