diff --git a/include/constants/hold_effects.h b/include/constants/hold_effects.h
index 13e8869442..3dc4a1389e 100644
--- a/include/constants/hold_effects.h
+++ b/include/constants/hold_effects.h
@@ -29,7 +29,7 @@
 #define HOLD_EFFECT_EXP_SHARE      25
 #define HOLD_EFFECT_QUICK_CLAW     26
 #define HOLD_EFFECT_FRIENDSHIP_UP  27
-#define HOLD_EFFECT_CURE_ATTRACT   28
+#define HOLD_EFFECT_MENTAL_HERB    28
 #define HOLD_EFFECT_CHOICE_BAND    29
 #define HOLD_EFFECT_FLINCH         30
 #define HOLD_EFFECT_BUG_POWER      31
@@ -154,4 +154,10 @@
 
 #define HOLD_EFFECT_CHOICE(holdEffect)((holdEffect == HOLD_EFFECT_CHOICE_BAND || holdEffect == HOLD_EFFECT_CHOICE_SCARF || holdEffect == HOLD_EFFECT_CHOICE_SPECS))
 
+// Terrain seed params
+#define HOLD_EFFECT_PARAM_ELECTRIC_TERRAIN  0
+#define HOLD_EFFECT_PARAM_GRASSY_TERRAIN    1
+#define HOLD_EFFECT_PARAM_MISTY_TERRAIN     2
+#define HOLD_EFFECT_PARAM_PSYCHIC_TERRAIN   3
+
 #endif // GUARD_HOLD_EFFECTS_H
diff --git a/src/battle_util.c b/src/battle_util.c
index cbcd445b7e..a9099c8f8e 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -3666,7 +3666,7 @@ u8 ItemBattleEffects(u8 caseID, u8 battlerId, bool8 moveTurn)
                     effect = ITEM_STATUS_CHANGE;
                 }
                 break;
-            case HOLD_EFFECT_CURE_ATTRACT:
+            case HOLD_EFFECT_MENTAL_HERB:
                 if (gBattleMons[battlerId].status2 & STATUS2_INFATUATION)
                 {
                     gBattleMons[battlerId].status2 &= ~(STATUS2_INFATUATION);
@@ -3769,7 +3769,7 @@ u8 ItemBattleEffects(u8 caseID, u8 battlerId, bool8 moveTurn)
                     effect = ITEM_EFFECT_OTHER;
                 }
                 break;
-            case HOLD_EFFECT_CURE_ATTRACT:
+            case HOLD_EFFECT_MENTAL_HERB:
                 if (gBattleMons[battlerId].status2 & STATUS2_INFATUATION)
                 {
                     gBattleMons[battlerId].status2 &= ~(STATUS2_INFATUATION);
diff --git a/src/data/items.h b/src/data/items.h
index 4f780a5b7a..1a9fca56c1 100644
--- a/src/data/items.h
+++ b/src/data/items.h
@@ -2640,7 +2640,7 @@ const struct Item gItems[] =
         .name = _("Mental Herb"),
         .itemId = ITEM_MENTAL_HERB,
         .price = 4000,
-        .holdEffect = HOLD_EFFECT_CURE_ATTRACT,
+        .holdEffect = HOLD_EFFECT_MENTAL_HERB,
         .description = sMentalHerbDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -6939,6 +6939,7 @@ const struct Item gItems[] =
         .itemId = ITEM_ELECTRIC_SEED,
         .price = 4000,
         .holdEffect = HOLD_EFFECT_SEEDS,
+        .holdEffectParam = HOLD_EFFECT_PARAM_ELECTRIC_TERRAIN,
         .description = sElectricSeedDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -6951,6 +6952,7 @@ const struct Item gItems[] =
         .itemId = ITEM_GRASSY_SEED,
         .price = 4000,
         .holdEffect = HOLD_EFFECT_SEEDS,
+        .holdEffectParam = HOLD_EFFECT_PARAM_GRASSY_TERRAIN,
         .description = sGrassySeedDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -6963,6 +6965,7 @@ const struct Item gItems[] =
         .itemId = ITEM_MISTY_SEED,
         .price = 4000,
         .holdEffect = HOLD_EFFECT_SEEDS,
+        .holdEffectParam = HOLD_EFFECT_PARAM_MISTY_TERRAIN,
         .description = sMistySeedDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,
@@ -6975,6 +6978,7 @@ const struct Item gItems[] =
         .itemId = ITEM_PSYCHIC_SEED,
         .price = 4000,
         .holdEffect = HOLD_EFFECT_SEEDS,
+        .holdEffectParam = HOLD_EFFECT_PARAM_PSYCHIC_TERRAIN,
         .description = sPsychicSeedDesc,
         .pocket = POCKET_ITEMS,
         .type = ITEM_USE_BAG_MENU,