The generator matrix

 1  1  1  1  1  1  1  1  1  1
 0  3  0  3  0  3  6  6  6  0
 0  0  3  6  6  3  0  3  6  0

generates a code of length 10 over Z9 who´s minimum homogenous weight is 18.

Homogenous weight enumerator: w(x)=1x^0+8x^18+54x^20+16x^21+2x^30

The gray image is a code over GF(3) with n=30, k=4 and d=18.
This code was found by Heurico 1.16 in 0.000218 seconds.