diff --git a/packages/farm/src/traits/plant.js b/packages/farm/src/traits/plant.js
index ae021ee..b3c01df 100644
--- a/packages/farm/src/traits/plant.js
+++ b/packages/farm/src/traits/plant.js
@@ -10,8 +10,6 @@ const decorate = compose(
 
 export default (latus) => class Plant extends decorate(Trait) {
 
-  static STIM_P = 10 / (latus.get('%humus.tps', 60) * 60);
-
   constructor() {
     super();
     this.growthElapsed = 0;
@@ -114,15 +112,15 @@ export default (latus) => class Plant extends decorate(Trait) {
       : [];
   }
 
-  tick() {
+  tick(elapsed) {
     if ('client' === process.env.SIDE) {
       return;
     }
     if (this.growthCondition(this.growthConditionContext)) {
       const {growthStage} = this.entity;
       const stageSpec = this.params.stageSpecs[growthStage];
-      if (Math.random() < this.constructor.STIM_P) {
-        this.growthElapsed += 0.1;
+      if (Math.random() < (4 / (60 / elapsed))) {
+        this.growthElapsed += 0.25;
       }
       if ('growAt' in stageSpec) {
         if (this.growthElapsed >= stageSpec.growAt) {