I played with the mapgrowth xml. The setting for wheat is wrote wrong. I rewrote the wheat setting similar to the way westby is wrote
<!-- wheat has 8 grow states, 9 withered -->
<fruit name="wheat" initialState="1" >
<!--Mar--> <period index="1"> <update range="4-5" add="1" /> </period>
<!--Apr--> <period index="2"> <update range="5-6" add="1" /> </period>
<!--May--> <period index="3"> <update range="6-7" add="1" /> </period>
<!--Jun--> <period index="4"> <update range="7-8" add="1" /> </period>
<!--Jul--> <period index="5"> <update range="8" set="8" /> </period>
<!--Aug--> <period index="6"> <update range="8-9" set="9" /> </period>
<!--Sept--> <period index="7" plantingAllowed="true"> <update range="1" add="1" /> </period>
<!--Oct--> <period index="8" plantingAllowed="true"> <update range="1-2" add="1" /> </period>
<!--Nov--> <period index="9" plantingAllowed="true"> <update range="1-2" add="1" /> </period>
<!--Dec--> <period index="10"> </period>
<!--Jan--> <period index="11"> </period>
<!--Feb--> <period index="12"> <update range="2-3" add="2" /> </period>
</fruit>