STEP 1:

Measure your side and back pieces and cut to size.  Attach the sides to the front and back securely.

STEP 2:

Add additional braces to each corner for extra support and security.

STEP 3:

Secure the greenhouse poles to the wood with 2-hole metal straps.  

STEP 4:

Add garden clamps to each pole for added security. 

STEP 5:

Secure eye screws at each corner then run paracord through and pull over the top to the opposite side.  Do this at all 4 corners to create an "X" shape over the top of the greenhouse. 

STEP 6:

Add garden stakes on each side looping paracord through and over for an additional level of security.

STEP 7:

Add concrete blocks and sand bags at the base of the tarps on sides, front, and back to secure as final touches.

Printable Tutorial on:  GARDENING.ORG