The Desert Botanical Garden in Phoenix offers FREE admission the second Tuesday of every month, from 1 - 8 p.m.
This month, that is Tuesday April 13th.
The entry into the seasonal Spring Butterfly exhibit is also free from 1 - 5 p.m. on April 13th.
The Desert Botanical Garden is located at 1201 N. Galvin Parkway in Phoenix, their number is 480-941-1225.
Find more details here if interested.