diff --git a/src/laws.c b/src/laws.c
index 731e46cea..99a61781e 100644
--- a/src/laws.c
+++ b/src/laws.c
@@ -681,8 +681,8 @@ growing_trees(region * r, const season_t current_season, const season_t last_wee
         a = a_find(r->attribs, &at_germs);
         if (!a) {
             a = a_add(&r->attribs, a_new(&at_germs));
-            a->data.sa[0] = (short)cap_int(rtrees(r, 0) / 9, 0, SHRT_MAX);
-            a->data.sa[1] = (short)cap_int(rtrees(r, 1) / 9, 0, SHRT_MAX);
+            a->data.sa[0] = (short)cap_int((8 + rtrees(r, 0)) / 9, 0, SHRT_MAX);
+            a->data.sa[1] = (short)cap_int((8 + rtrees(r, 1)) / 9, 0, SHRT_MAX);
         }
         else if (a->data.sa[0] < 0 || a->data.sa[1] < 0) {
             a->data.sa[0] = (short)cap_int(a->data.sa[0], 0, SHRT_MAX);