diff --git a/app/views/crops/show.html.haml b/app/views/crops/show.html.haml
index 0cee3b1a6..a19421ff1 100644
--- a/app/views/crops/show.html.haml
+++ b/app/views/crops/show.html.haml
@@ -16,9 +16,7 @@
 
     = render :partial => 'photos', :locals => { :crop => @crop }
 
-    %h2 Who's planted this crop?
-
-    %p
+    %h2
       - if @crop.plantings.size > 0
         = @crop.name.titleize
         has been planted
@@ -27,9 +25,18 @@
       - else
         Nobody is growing this yet. You could be the first!
 
+    %p
+      Only plantings by members who have set their locations are shown on this map.
+      - if current_member && current_member.location.blank?
+        = link_to "Set your location.", edit_member_registration_path
+
+
     %div#map
 
     - if @crop.plantings.size > 0
+
+      %h2 All plantings
+
       - @crop.plantings.each do |p|
         = render :partial => "plantings/thumbnail", :locals => { :planting => p, :title => 'owner' }
 
diff --git a/spec/views/crops/show.html.haml_spec.rb b/spec/views/crops/show.html.haml_spec.rb
index 4b637cc1d..1805dc7e1 100644
--- a/spec/views/crops/show.html.haml_spec.rb
+++ b/spec/views/crops/show.html.haml_spec.rb
@@ -33,6 +33,35 @@ describe "crops/show" do
     end
   end
 
+  context "map" do
+    it "has a map" do
+      render
+      assert_select("div#map")
+    end
+
+    it "explains what's shown on the map" do
+      render
+      rendered.should contain "Only plantings by members who have set their locations are shown on this map"
+    end
+
+    it "shows a 'set your location' link to people who need to" do
+      @nowhere = FactoryGirl.create(:member)
+      sign_in @nowhere
+      controller.stub(:current_user) { @nowhere }
+      render
+      rendered.should contain "Set your location"
+    end
+
+    it "doesn't show 'set your location' to people who have one" do
+      @somewhere = FactoryGirl.create(:london_member)
+      sign_in @somewhere
+      controller.stub(:current_user) { @somewhere }
+      render
+      rendered.should_not contain "Set your location"
+    end
+
+  end
+
   it "shows the wikipedia URL" do
     render
     assert_select("a[href=#{@crop.en_wikipedia_url}]", 'Wikipedia (English)')