The generator matrix

 1  0  0  1  1  1  1  1  1  1  1  6
 0  1  0  0  1  7  3  5  6  3  5  1
 0  0  1  1  1  6  5  7  7  5  1  4
 0  0  0  6  0  6  6  3  3  0  3  0
 0  0  0  0  3  6  0  0  3  3  3  3

generates a code of length 12 over Z9 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+444x^18+1368x^21+2646x^24+1952x^27+144x^30+6x^36

The gray image is a code over GF(3) with n=36, k=8 and d=18.
This code was found by Heurico 1.16 in 2.11 seconds.