diff --git a/app/models/crop.rb b/app/models/crop.rb
index 490a35d71..bead8e89b 100644
--- a/app/models/crop.rb
+++ b/app/models/crop.rb
@@ -11,15 +11,15 @@ class Crop < ActiveRecord::Base
   has_many :scientific_names, after_add: :update_index, after_remove: :update_index, dependent: :destroy
   accepts_nested_attributes_for :scientific_names, allow_destroy: true, reject_if: :all_blank
   has_many :alternate_names, after_add: :update_index, after_remove: :update_index, dependent: :destroy
-  has_many :plantings
+  has_many :plantings, dependent: :destroy
+  has_many :seeds, dependent: :destroy
+  has_many :harvests, dependent: :destroy
   has_many :photos, through: :plantings
-  has_many :seeds
-  has_many :harvests
   has_many :plant_parts, -> { uniq.reorder("plant_parts.name") }, through: :harvests
   belongs_to :creator, class_name: 'Member'
   belongs_to :requester, class_name: 'Member'
   belongs_to :parent, class_name: 'Crop'
-  has_many :varieties, class_name: 'Crop', foreign_key: 'parent_id'
+  has_many :varieties, class_name: 'Crop', foreign_key: 'parent_id', dependent: :nullify
   has_and_belongs_to_many :posts # rubocop:disable Rails/HasAndBelongsToMany
 
   ##