diff --git a/botany/four_course_rotation.wiki b/botany/four_course_rotation.wiki
new file mode 100644
index 0000000..3f98a11
--- /dev/null
+++ b/botany/four_course_rotation.wiki
@@ -0,0 +1,35 @@
+= Four course rotation =
+
+The four course rotation is the ecologically sound system of husbandry used in
+[[high_farming]]. It is a form of crop rotation
+
+1) one year [[ley]]
+   - grow for one year
+   - let livestock graze from it
+   - allows for nitrogen to build in the soil
+2) root break
+   - plant,
+     - turnips
+     - swedes
+     - potatoes
+     - mangold
+     - kale
+   - these increase soil fertility
+   - apply nearly all manure to this field
+   - called cleaning crops, as land must be hoed several times to plant in rows
+   - Also creates the crops to be eaten during the winter for feeding livestock
+3) Winter cereal break
+   - plant,
+     - wheat
+     - beans
+     - barley
+     - oats
+     - rye
+   - All these crops are sown in autumn
+   - this is the primary "cash crop" or "staple food"
+4) Spring cereal break
+   - Spring sown wheat or barley
+   - Undersow ley after placing the wheat and barley seed
+   - used crop for beer, feeding livestock, and making manure
+
+Historically this method created 2 tons of wheat to the acre
diff --git a/botany/high_farming.wiki b/botany/high_farming.wiki
index ffbd665..a59d6e6 100644
--- a/botany/high_farming.wiki
+++ b/botany/high_farming.wiki
@@ -33,3 +33,7 @@ arks for hens, and electric fences for pigs.
 
 * Animals must move plots over years, as parisites build up on that plot
   * Same applies for blights on plants
+
+== Crop roration ==
+
+See [[four_course_rotation]]
diff --git a/botany/ley.wiki b/botany/ley.wiki
new file mode 100644
index 0000000..6d1822b
--- /dev/null
+++ b/botany/ley.wiki
@@ -0,0 +1,4 @@
+= Ley =
+
+Ley is the combination of small grasses and clovers, common in most large open
+grassy fields