diff --git a/api/database.php b/api/database.php
index 5d4bac9..08f8de8 100644
--- a/api/database.php
+++ b/api/database.php
@@ -363,6 +363,10 @@ function estimateOpenedExpiryDaysPHP(string $name, string $category, string $loc
         if (preg_match('/\b(yogurt|yaourt|yoghurt)\b/', $n)) return 2;
         if (preg_match('/\blatte\b/', $n)) return 1;
         if (preg_match('/\bformaggio\b/', $n)) return 2;
+        // Root vegetables / tubers in pantry: sfusi in un sacchetto, durano 3-5 settimane
+        if (preg_match('/\b(patata|patate|tubero)\b/', $n)) return 30;
+        if (preg_match('/\b(cipolla|cipolle|aglio|scalogno|porro)\b/', $n)) return 30;
+        if (preg_match('/\b(carota|carote)\b/', $n)) return 14;
         return 60; // generic pantry fallback
     }
 
diff --git a/assets/js/app.js b/assets/js/app.js
index 3a615b2..f7ba6ee 100644
--- a/assets/js/app.js
+++ b/assets/js/app.js
@@ -1553,7 +1553,7 @@ function estimateExpiryDays(product, location) {
     else if (/carota|carote|zucchina|zucchine|peperoni|melanzane/.test(name)) days = 7;
     else if (/broccoli|cavolfiore|cavolo|spinaci|bietola/.test(name)) days = 5;
     else if (/cipolla|cipolle/.test(name)) days = 10;
-    else if (/patata|patate/.test(name)) days = 14;
+    else if (/patata|patate/.test(name)) days = 30; // whole tubers in a bag, pantry: 3-5 weeks
     else if (/biscott|cracker|grissini|fette\s+biscott/.test(name)) days = 180;
     else if (/nutella|marmellata|miele/.test(name)) days = 365;
     else if (/passata|pelati|pomodor/.test(name)) days = 730;
@@ -1573,7 +1573,7 @@ function estimateExpiryDays(product, location) {
         else if (/arancia|arance|agrumi|mandarini|limone|limoni/.test(name)) days = Math.max(days, 21);
         else if (/carota|carote/.test(name)) days = Math.max(days, 21);
         else if (/cipolla/.test(name)) days = Math.max(days, 14);
-        else if (/patata|patate/.test(name)) days = Math.max(days, 21);
+        else if (/patata|patate/.test(name)) days = Math.max(days, 30);
         else if (/pera|pere/.test(name)) days = Math.max(days, 21);
         else if (/kiwi/.test(name)) days = Math.max(days, 28);
         else if (/uva/.test(name)) days = Math.max(days, 14);