diff --git a/app/ecs-components/plant.js b/app/ecs-components/plant.js
new file mode 100644
index 0000000..dd8fe93
--- /dev/null
+++ b/app/ecs-components/plant.js
@@ -0,0 +1,58 @@
+import Component from '@/ecs/component.js';
+import Script from '@/util/script.js';
+
+export default class Plant extends Component {
+  instanceFromSchema() {
+    const {ecs} = this;
+    const Instance = super.instanceFromSchema();
+    return class PlantInstance extends Instance {
+      mayGrow() {
+        return this.mayGrowScriptInstance.evaluateSync();
+      }
+      grow() {
+        const {Ticking} = ecs.get(this.entity);
+        Ticking.addTickingPromise(this.growScriptInstance.tickingPromise());
+      }
+    };
+  }
+  async load(instance) {
+    // heavy handed...
+    if ('undefined' !== typeof window) {
+      return;
+    }
+    const {readAsset} = this.ecs;
+    await readAsset(instance.growScript)
+      .then(async (code) => {
+        if (code.byteLength > 0) {
+          const context = {
+            ecs: this.ecs,
+            plant: instance,
+          };
+          instance.growScriptInstance = await Script.fromCode((new TextDecoder()).decode(code), context);
+        }
+      });
+
+    await readAsset(instance.mayGrowScript)
+      .then(async (code) => {
+        if (code.byteLength > 0) {
+          const context = {
+            ecs: this.ecs,
+            plant: instance,
+          };
+          instance.mayGrowScriptInstance = await Script.fromCode((new TextDecoder()).decode(code), context);
+        }
+      });
+  }
+  // heavy handed...
+  markChange() {}
+  static properties = {
+    growScript: {type: 'string'},
+    growth: {type: 'uint16'},
+    mayGrowScript: {type: 'string'},
+    stage: {type: 'uint8'},
+    stages: {
+      type: 'array',
+      subtype: {type: 'uint16'},
+    },
+  };
+}
diff --git a/app/ecs-systems/plant-growth.js b/app/ecs-systems/plant-growth.js
new file mode 100644
index 0000000..868b3a4
--- /dev/null
+++ b/app/ecs-systems/plant-growth.js
@@ -0,0 +1,27 @@
+import {System} from '@/ecs/index.js';
+
+export default class PlantGrowth extends System {
+
+  static queries() {
+    return {
+      default: ['Plant'],
+    };
+  }
+
+  tick(elapsed) {
+    for (const {Plant} of this.select('default')) {
+      if (65535 === Plant.growth || !Plant.mayGrow()) {
+        continue;
+      }
+      const stage = Math.floor(Plant.stage);
+      Plant.growth = Math.min(
+        Plant.growth + (((Math.random() + 0.5) * elapsed) / Plant.stages[stage]) * 65535,
+        65535,
+      );
+      if (65535 === Plant.growth) {
+        Plant.grow();
+      }
+    }
+  }
+
+}
diff --git a/app/engine.js b/app/engine.js
index 5c86e63..66e6324 100644
--- a/app/engine.js
+++ b/app/engine.js
@@ -118,11 +118,39 @@ export default class Engine {
         ],
       },
     });
+    const plant = {
+      Plant: {
+        growScript: '/assets/tomato-plant/grow.js',
+        mayGrowScript: '/assets/tomato-plant/may-grow.js',
+        stages: [300, 300, 300, 300, 300],
+      },
+      Sprite: {
+        anchor: {x: 0.5, y: 0.75},
+        animation: 'stage/0',
+        frame: 0,
+        frames: 1,
+        source: '/assets/tomato-plant/tomato-plant.json',
+        speed: 0,
+      },
+      Ticking: {},
+      VisibleAabb: {},
+    };
+    const promises = [];
+    for (let y = 0; y < 10; ++y) {
+      for (let x = 0; x < 10; ++x) {
+        promises.push(ecs.create({
+          ...plant,
+          Position: {x: 8 + x * 16, y: 8 + y * 16},
+        }));
+      }
+    }
+    await Promise.all(promises);
     const defaultSystems = [
       'ResetForces',
       'ApplyControlMovement',
       'ApplyForces',
       'ClampPositions',
+      'PlantGrowth',
       'FollowCamera',
       'CalculateAabbs',
       'UpdateSpatialHash',
diff --git a/public/assets/tomato-plant/grow.js b/public/assets/tomato-plant/grow.js
new file mode 100644
index 0000000..f6eea88
--- /dev/null
+++ b/public/assets/tomato-plant/grow.js
@@ -0,0 +1,13 @@
+const {Sprite} = ecs.get(plant.entity);
+
+if (plant.stage < 3) {
+  plant.stage += 1
+}
+if (4 === plant.stage) {
+  plant.stage = 3
+}
+if (3 !== plant.stage) {
+  plant.growth = 0
+}
+
+Sprite.animation = ['stage', plant.stage].join('/')
diff --git a/public/assets/tomato-plant/may-grow.js b/public/assets/tomato-plant/may-grow.js
new file mode 100644
index 0000000..dc36c3b
--- /dev/null
+++ b/public/assets/tomato-plant/may-grow.js
@@ -0,0 +1 @@
+3 !== plant.stage
diff --git a/public/assets/tomato-plant/tomato-plant.json b/public/assets/tomato-plant/tomato-plant.json
new file mode 100644
index 0000000..13e165f
--- /dev/null
+++ b/public/assets/tomato-plant/tomato-plant.json
@@ -0,0 +1 @@
+{"animations":{"stage/0":["tomato-plant/tomato-plant/0"],"stage/1":["tomato-plant/tomato-plant/1"],"stage/2":["tomato-plant/tomato-plant/2"],"stage/3":["tomato-plant/tomato-plant/3"],"stage/4":["tomato-plant/tomato-plant/4"]},"frames":{"tomato-plant/tomato-plant/0":{"frame":{"x":0,"y":0,"w":16,"h":32},"spriteSourceSize":{"x":0,"y":0,"w":16,"h":32},"sourceSize":{"w":16,"h":32}},"tomato-plant/tomato-plant/1":{"frame":{"x":16,"y":0,"w":16,"h":32},"spriteSourceSize":{"x":0,"y":0,"w":16,"h":32},"sourceSize":{"w":16,"h":32}},"tomato-plant/tomato-plant/2":{"frame":{"x":32,"y":0,"w":16,"h":32},"spriteSourceSize":{"x":0,"y":0,"w":16,"h":32},"sourceSize":{"w":16,"h":32}},"tomato-plant/tomato-plant/3":{"frame":{"x":48,"y":0,"w":16,"h":32},"spriteSourceSize":{"x":0,"y":0,"w":16,"h":32},"sourceSize":{"w":16,"h":32}},"tomato-plant/tomato-plant/4":{"frame":{"x":64,"y":0,"w":16,"h":32},"spriteSourceSize":{"x":0,"y":0,"w":16,"h":32},"sourceSize":{"w":16,"h":32}}},"meta":{"format":"RGBA8888","image":"./tomato-plant.png","scale":1,"size":{"w":80,"h":32}}}
\ No newline at end of file
diff --git a/public/assets/tomato-plant/tomato-plant.png b/public/assets/tomato-plant/tomato-plant.png
new file mode 100644
index 0000000..de7985b
Binary files /dev/null and b/public/assets/tomato-plant/tomato-plant.png differ