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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>

I had the same thing and used the same solution as you. For some reason he has June and July as Set= "9" instead of add="1", which means it goes straight to withered.