diff --git a/frontend/src/components/Applications/ApplicationPlanModal.js b/frontend/src/components/Applications/ApplicationPlanModal.js
index 91deef5..510132e 100644
--- a/frontend/src/components/Applications/ApplicationPlanModal.js
+++ b/frontend/src/components/Applications/ApplicationPlanModal.js
@@ -202,6 +202,29 @@ const ApplicationPlanModal = ({
     console.log('=== End Debug ===\n');
   }, [selectedPropertyDetails, mapCenter, equipment, products, nozzles]);
 
+  // Helper to pick appropriate seed rate for scenario
+  const pickSeedRate = (rates, mode) => {
+    if (!Array.isArray(rates) || rates.length === 0) return null;
+    const list = rates.map(r => ({
+      ...r,
+      _t: `${(r.applicationType || '')} ${(r.notes || '')}`.toLowerCase()
+    }));
+    const isNew = mode === 'new_seed';
+    // Prefer explicit text match in applicationType/notes
+    let match = list.find(r => isNew ? r._t.includes('new') : r._t.includes('over'));
+    if (match) return match;
+    // Fallback: choose by amount (new lawn usually higher)
+    const numeric = rates.filter(r => !isNaN(parseFloat(r.rateAmount)));
+    if (numeric.length) {
+      return numeric.reduce((best, r) => {
+        const a = parseFloat(best.rateAmount);
+        const b = parseFloat(r.rateAmount);
+        return isNew ? (b > a ? r : best) : (b < a ? r : best);
+      }, numeric[0]);
+    }
+    return rates[0];
+  };
+
   // Handle area selection on map
   const handleAreaClick = (area) => {
     setSelectedAreas(prev => {
@@ -250,6 +273,20 @@ const ApplicationPlanModal = ({
     }, 0);
   };
 
+  // When seed scenario changes, auto-pick a sensible default rate for seed products without a rate yet
+  useEffect(() => {
+    if (applicationType !== 'seed') return;
+    setSelectedProducts(prev => prev.map(p => {
+      if (p.productType !== 'seed' || p.rateAmount) return p;
+      const pd = products.find(pp => (pp.uniqueId || pp.id) === p.uniqueId);
+      if (pd && pd.rates && pd.rates.length) {
+        const chosen = pickSeedRate(pd.rates, seedMode) || pd.rates[0];
+        return { ...p, rateAmount: chosen.rateAmount || chosen.amount, rateUnit: chosen.rateUnit || chosen.unit || 'lb/1000sqft' };
+      }
+      return p;
+    }));
+  }, [seedMode, applicationType, products]);
+
   // Remove product from plan
   const removeProduct = (index) => {
     setSelectedProducts(prev => prev.filter((_, i) => i !== index));
@@ -758,17 +795,13 @@ const ApplicationPlanModal = ({
                             
                             // For shared products: check rates array
                             if (selectedProduct.isShared && selectedProduct.rates && selectedProduct.rates.length > 0) {
-                              let defaultRate = selectedProduct.rates[0];
+                              let chosen = selectedProduct.rates[0];
                               if (applicationType === 'seed') {
-                                const modeKey = seedMode === 'new_seed' ? 'new' : 'over';
-                                const match = selectedProduct.rates.find(r => {
-                                  const t = (r.applicationType || '').toLowerCase();
-                                  return t.includes('seed') && t.includes(modeKey);
-                                });
-                                if (match) defaultRate = match;
+                                const picked = pickSeedRate(selectedProduct.rates, seedMode);
+                                if (picked) chosen = picked;
                               }
-                              updateProduct(index, 'rateAmount', defaultRate.rateAmount || defaultRate.amount);
-                              updateProduct(index, 'rateUnit', defaultRate.rateUnit || defaultRate.unit);
+                              updateProduct(index, 'rateAmount', chosen.rateAmount || chosen.amount);
+                              updateProduct(index, 'rateUnit', chosen.rateUnit || chosen.unit || ((applicationType === 'seed' || applicationType === 'granular') ? 'lb/1000sqft' : 'oz/1000sqft'));
                               rateSet = true;
                             }
                             // For custom products: check customRateAmount and customRateUnit