diff --git a/Pages/AdminPlants.php b/Pages/AdminPlants.php
index 8f30636..2ffd345 100644
--- a/Pages/AdminPlants.php
+++ b/Pages/AdminPlants.php
@@ -48,6 +48,20 @@ $PageSection = "Admin";
                     >
                         New plant
                     </button>
+
+                    <label for="AdminPlantDuplicateSelect">
+                        Duplicate existing
+                    </label>
+
+                    <select id="AdminPlantDuplicateSelect"></select>
+
+                    <button
+                        id="AdminPlantDuplicateButton"
+                        class="ActionButton AdminInlineButton"
+                        type="button"
+                    >
+                        Duplicate
+                    </button>
                 </div>
 
                 <form
diff --git a/Pages/Shop.php b/Pages/Shop.php
index 0c9c2ec..c1b435c 100644
--- a/Pages/Shop.php
+++ b/Pages/Shop.php
@@ -44,29 +44,62 @@ $PageSection = "Shop";
                 id="PermanentUpgrades"
                 class="ShopSection"
             >
-                <h2>Permanent upgrades</h2>
-
-                <p>
-                    Expand your active Garden, buy additional Gardens,
-                    or unlock information and quality-of-life features.
-                </p>
+                <h2 class="ShopSectionHeading">
+                    <button
+                        id="PermanentUpgradesToggle"
+                        class="ShopSectionToggle"
+                        type="button"
+                        aria-expanded="false"
+                        aria-controls="PermanentUpgradesContent"
+                    >
+                        <span class="ShopSectionArrow" aria-hidden="true">&gt;</span>
+                        <span>Permanent upgrades</span>
+                    </button>
+                </h2>
 
                 <div
-                    id="ShopGardenUpgradeList"
-                    class="ShopSeedList"
-                ></div>
+                    id="PermanentUpgradesContent"
+                    class="ShopSectionContent"
+                    hidden
+                >
+                    <p>
+                        Expand your active Garden, buy additional Gardens,
+                        or unlock information and quality-of-life features.
+                    </p>
+
+                    <div
+                        id="ShopGardenUpgradeList"
+                        class="ShopSeedList"
+                    ></div>
+                </div>
             </section>
 
             <section
                 id="Seeds"
                 class="ShopSection"
             >
-                <h2>Seeds</h2>
+                <h2 class="ShopSectionHeading">
+                    <button
+                        id="SeedsToggle"
+                        class="ShopSectionToggle"
+                        type="button"
+                        aria-expanded="true"
+                        aria-controls="SeedsContent"
+                    >
+                        <span class="ShopSectionArrow" aria-hidden="true">&gt;</span>
+                        <span>Seeds</span>
+                    </button>
+                </h2>
 
                 <div
-                    id="ShopSeedList"
-                    class="ShopSeedList"
-                ></div>
+                    id="SeedsContent"
+                    class="ShopSectionContent"
+                >
+                    <div
+                        id="ShopSeedList"
+                        class="ShopSeedList"
+                    ></div>
+                </div>
             </section>
 
             <p id="ShopMessage" class="PageMessage">
diff --git a/Scripts/Garden/AdminPlantEditor.js b/Scripts/Garden/AdminPlantEditor.js
index dff8862..8489604 100644
--- a/Scripts/Garden/AdminPlantEditor.js
+++ b/Scripts/Garden/AdminPlantEditor.js
@@ -64,6 +64,13 @@ function BindAdminPlantEditor() {
         StartNewAdminPlant
     );
 
+    document.getElementById(
+        "AdminPlantDuplicateButton"
+    ).addEventListener(
+        "click",
+        DuplicateAdminPlant
+    );
+
     document.getElementById(
         "AdminPlantForm"
     ).addEventListener(
@@ -279,6 +286,7 @@ async function LoadAdminPlants(
         AdminPlantMutationCatalogue;
 
     RenderAdminPlantSelect();
+    RenderAdminPlantDuplicateSelect();
 
     const Keys =
         GetSortedAdminPlantKeys();
@@ -376,6 +384,70 @@ function RenderAdminPlantSelect() {
 }
 
 
+function RenderAdminPlantDuplicateSelect() {
+    const Select =
+        document.getElementById(
+            "AdminPlantDuplicateSelect"
+        );
+
+    if (Select === null) {
+        return;
+    }
+
+    const PreviousValue =
+        Select.value;
+
+    Select.replaceChildren();
+
+    for (
+        const PlantKey
+        of GetSortedAdminPlantKeys()
+    ) {
+        const Plant =
+            AdminPlantCatalogue[
+                PlantKey
+            ];
+
+        const Option =
+            document.createElement(
+                "option"
+            );
+
+        Option.value =
+            PlantKey;
+
+        Option.textContent =
+            String(
+                Plant.Id
+            ).padStart(
+                3,
+                "0"
+            ) +
+            " — " +
+            Plant.Name +
+            (
+                Plant.Archived === true
+                    ? " (archived)"
+                    : ""
+            );
+
+        Select.appendChild(
+            Option
+        );
+    }
+
+    if (
+        PreviousValue !== "" &&
+        AdminPlantCatalogue[
+            PreviousValue
+        ] !== undefined
+    ) {
+        Select.value =
+            PreviousValue;
+    }
+}
+
+
 function LoadAdminPlantIntoForm(
     PlantKey
 ) {
@@ -475,6 +547,123 @@ function LoadAdminPlantIntoForm(
 }
 
 
+function DuplicateAdminPlant() {
+    const SourcePlantKey =
+        document.getElementById(
+            "AdminPlantDuplicateSelect"
+        ).value;
+
+    const SourcePlant =
+        AdminPlantCatalogue[
+            SourcePlantKey
+        ];
+
+    if (SourcePlant === undefined) {
+        SetAdminPlantMessage(
+            "Choose a plant to duplicate."
+        );
+
+        return;
+    }
+
+    AdminPlantEditingKey = null;
+
+    document.getElementById(
+        "AdminPlantSelect"
+    ).value = "";
+
+    SetAdminPlantField(
+        "AdminPlantId",
+        GetNextAdminPlantId()
+    );
+
+    SetAdminPlantField(
+        "AdminPlantKey",
+        ""
+    );
+
+    SetAdminPlantField(
+        "AdminPlantName",
+        ""
+    );
+
+    SetAdminPlantField(
+        "AdminPlantDescription",
+        SourcePlant.Description ?? ""
+    );
+
+    SetAdminPlantField(
+        "AdminPlantTags",
+        Array.isArray(
+            SourcePlant.Tags
+        )
+            ? SourcePlant.Tags.join(
+                ", "
+            )
+            : ""
+    );
+
+    SetAdminPlantDurationFields(
+        Number(
+            SourcePlant.GrowthTime ??
+            0
+        )
+    );
+
+    SetAdminPlantField(
+        "AdminPlantHarvestMultiplier",
+        Number(
+            SourcePlant.HarvestMultiplier ??
+            1.5
+        )
+    );
+
+    document.getElementById(
+        "AdminPlantShopPlant"
+    ).checked =
+        SourcePlant.Shop?.ShopPlant === true;
+
+    SetAdminPlantField(
+        "AdminPlantBaseCost",
+        SourcePlant.Shop?.BaseCost ?? ""
+    );
+
+    SetAdminPlantField(
+        "AdminPlantEffects",
+        JSON.stringify(
+            SourcePlant.Effects ?? {},
+            null,
+            4
+        )
+    );
+
+    document.getElementById(
+        "AdminPlantId"
+    ).readOnly = false;
+
+    document.getElementById(
+        "AdminPlantKey"
+    ).readOnly = false;
+
+    document.getElementById(
+        "AdminPlantArchiveNote"
+    ).hidden = true;
+
+    UpdateAdminPlantShopFields();
+    RenderAdminPlantPreview();
+
+    document.getElementById(
+        "AdminPlantName"
+    ).focus();
+
+    SetAdminPlantMessage(
+        "Duplicated " +
+        SourcePlant.Name +
+        ". Give the new plant a name and Plant Key before saving. Sprites are not copied."
+    );
+}
+
+
 function StartNewAdminPlant() {
     AdminPlantEditingKey = null;
 
diff --git a/Scripts/Garden/Shop.js b/Scripts/Garden/Shop.js
index 40c2fe1..af7e673 100644
--- a/Scripts/Garden/Shop.js
+++ b/Scripts/Garden/Shop.js
@@ -21,10 +21,69 @@ async function StartShop() {
 
     ShopSave = await LoadGame();
 
+    BindShopSectionToggles();
     RenderShop();
 }
 
 
+function BindShopSectionToggles() {
+    BindShopSectionToggle(
+        "PermanentUpgradesToggle",
+        "PermanentUpgradesContent"
+    );
+
+    BindShopSectionToggle(
+        "SeedsToggle",
+        "SeedsContent"
+    );
+}
+
+
+function BindShopSectionToggle(
+    ToggleId,
+    ContentId
+) {
+    const Toggle =
+        document.getElementById(
+            ToggleId
+        );
+
+    const Content =
+        document.getElementById(
+            ContentId
+        );
+
+    if (
+        Toggle === null ||
+        Content === null
+    ) {
+        return;
+    }
+
+    Toggle.addEventListener(
+        "click",
+        () => {
+            const IsExpanded =
+                Toggle.getAttribute(
+                    "aria-expanded"
+                ) === "true";
+
+            const NewExpanded =
+                !IsExpanded;
+
+            Toggle.setAttribute(
+                "aria-expanded",
+                String(NewExpanded)
+            );
+
+            Content.hidden =
+                !NewExpanded;
+
+        }
+    );
+}
+
+
 function RenderShop() {
     RenderShopCurrency();
     RenderShopSeeds();
@@ -413,7 +472,12 @@ function CreatePlantInformationUpgradeCard() {
         );
 
     Header.className =
-        "ShopItemHeader";
+        "ShopItemHeader" +
+        (
+            IsOwned
+                ? " ShopItemHeaderOwned"
+                : ""
+        );
 
 
     const Name =
@@ -529,7 +593,12 @@ function CreateGardenOverviewUpgradeCard() {
         );
 
     Header.className =
-        "ShopItemHeader";
+        "ShopItemHeader" +
+        (
+            IsOwned
+                ? " ShopItemHeaderOwned"
+                : ""
+        );
 
 
     const Name =
@@ -645,7 +714,12 @@ function CreateGardenEconomyUpgradeCard() {
         );
 
     Header.className =
-        "ShopItemHeader";
+        "ShopItemHeader" +
+        (
+            IsOwned
+                ? " ShopItemHeaderOwned"
+                : ""
+        );
 
 
     const Name =
@@ -759,7 +833,12 @@ function CreateMutationHintsUpgradeCard() {
         );
 
     Header.className =
-        "ShopItemHeader";
+        "ShopItemHeader" +
+        (
+            IsOwned
+                ? " ShopItemHeaderOwned"
+                : ""
+        );
 
 
     const Name =
diff --git a/Styles/Style.css b/Styles/Style.css
index 9c7a2ad..8424134 100644
--- a/Styles/Style.css
+++ b/Styles/Style.css
@@ -1126,6 +1126,48 @@ input, button, textarea, select {
     margin-top: 1.5rem;
 }
 
+.ShopSectionHeading {
+    margin-bottom: 0.75rem;
+}
+
+.ShopSectionToggle {
+    display: flex;
+    width: 100%;
+    gap: 0.55rem;
+    align-items: center;
+    padding: 0;
+    cursor: pointer;
+    color: var(--Text);
+    background: none;
+    border: 0;
+    font-size: inherit;
+    text-align: left;
+}
+
+.ShopSectionToggle:hover {
+    color: var(--Sky);
+}
+
+.ShopSectionToggle:focus-visible {
+    outline: 3px solid var(--Yellow);
+    outline-offset: 3px;
+}
+
+.ShopSectionArrow {
+    width: 1ch;
+    flex: 0 0 1ch;
+    color: var(--Overlay2);
+    transform-origin: center;
+}
+
+.ShopSectionToggle[aria-expanded="true"] .ShopSectionArrow {
+    transform: rotate(90deg);
+}
+
+.ShopSectionContent[hidden] {
+    display: none;
+}
+
 .ShopSeedList {
     display: grid;
     grid-template-columns: repeat( auto-fit, minmax(15rem, 1fr) );
@@ -1153,6 +1195,11 @@ input, button, textarea, select {
     margin: 0;
 }
 
+.ShopItemHeaderOwned {
+    color: var(--Overlay1);
+    border-bottom-color: var(--Surface1);
+}
+
 .ShopItemBody {
     display: grid;
     grid-template-columns: 5.75rem minmax(0, 1fr);