diff --git a/src/main/java/ch/zhaw/gartenverwaltung/CropDetailController.java b/src/main/java/ch/zhaw/gartenverwaltung/CropDetailController.java
index 90f52d8..bbe7cea 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/CropDetailController.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/CropDetailController.java
@@ -285,6 +285,7 @@ public class CropDetailController {
 
         if (appLoader.loadPaneToDialog("TaskFormular.fxml", dialogPane) instanceof TaskFormularController controller) {
             controller.setCorp(this.crop);
+            controller.initSaveButton((Button) dialogPane.lookupButton(saveTask));
             if (!newTask) {
                 controller.setTaskValue(givenTask);
             }
@@ -322,6 +323,7 @@ public class CropDetailController {
         if (appLoader.loadPaneToDialog("TextFieldFormular.fxml", dialogPane) instanceof TextFieldFormularController controller) {
             controller.setDescription_label(labelDescription);
             controller.setValueTextArea(value);
+            controller.initSaveButton((Button) dialogPane.lookupButton(save));
 
             dialog.setResultConverter(button -> button.equals(save) ? controller.getValue() : null);
 
diff --git a/src/main/java/ch/zhaw/gartenverwaltung/TaskFormularController.java b/src/main/java/ch/zhaw/gartenverwaltung/TaskFormularController.java
index 938eea9..936bf09 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/TaskFormularController.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/TaskFormularController.java
@@ -2,12 +2,14 @@ package ch.zhaw.gartenverwaltung;
 
 import ch.zhaw.gartenverwaltung.types.Crop;
 import ch.zhaw.gartenverwaltung.types.Task;
+import javafx.beans.binding.Binding;
+import javafx.beans.binding.Bindings;
+import javafx.beans.binding.BooleanBinding;
+import javafx.beans.value.ChangeListener;
+import javafx.beans.value.ObservableValue;
 import javafx.fxml.FXML;
 import javafx.fxml.Initializable;
-import javafx.scene.control.DateCell;
-import javafx.scene.control.DatePicker;
-import javafx.scene.control.TextArea;
-import javafx.scene.control.TextField;
+import javafx.scene.control.*;
 import javafx.util.Callback;
 
 import java.net.URL;
@@ -56,7 +58,7 @@ public class TaskFormularController implements Initializable {
         }
     }
 
-    private Callback<DatePicker, DateCell> getDayCellFactory() {
+    private Callback<DatePicker, DateCell> getDayCellFactoryStartDate() {
 
         return (datePicker) -> new DateCell() {
             private final LocalDate today = LocalDate.now();
@@ -71,16 +73,61 @@ public class TaskFormularController implements Initializable {
                     setDisable(false);
                     setStyle("-fx-background-color: #32CD32;");
                 }
+
+                if (end_datePicker.getValue() != null && item.compareTo(end_datePicker.getValue()) > 0) {
+                    setDisable(true);
+                    setStyle("-fx-background-color: #ffc0cb;");
+                }
             }
         };
     }
 
+    private Callback<DatePicker, DateCell> getDayCellFactoryEndDate() {
+
+        return (datePicker) -> new DateCell() {
+            private final LocalDate today = LocalDate.now();
+
+            @Override
+            public void updateItem(LocalDate item, boolean empty) {
+                super.updateItem(item, empty);
+                setDisable(true);
+                setStyle("-fx-background-color: #ffc0cb;");
+
+                if (item.compareTo(today) > 0 && item.compareTo(crop.getStartDate()) > 0) {
+                    setDisable(false);
+                    setStyle("-fx-background-color: #32CD32;");
+                }
+
+                if (start_datePicker.getValue() != null && item.compareTo(start_datePicker.getValue()) < 0) {
+                    setDisable(true);
+                    setStyle("-fx-background-color: #ffc0cb;");
+                }
+            }
+        };
+    }
+
+    public void initSaveButton(Button button) {
+        interval_field.textProperty().addListener((observable, oldValue, newValue) -> {
+            if (!newValue.matches("\\d*")) {
+                interval_field.setText(newValue.replaceAll("[^\\d]", ""));
+            }
+        });
+
+        button.disableProperty().bind(start_datePicker.valueProperty().isNull()
+                .or(end_datePicker.valueProperty().isNull())
+                .or(taskName_field.textProperty().isEmpty())
+                .or(description_area.textProperty().isEmpty())
+                .or(interval_field.textProperty().isEmpty()));
+
+
+    }
+
     @Override
     public void initialize(URL location, ResourceBundle resources) {
-        start_datePicker.setDayCellFactory(getDayCellFactory());
+        start_datePicker.setDayCellFactory(getDayCellFactoryStartDate());
         start_datePicker.setEditable(false);
 
-        end_datePicker.setDayCellFactory(getDayCellFactory());
+        end_datePicker.setDayCellFactory(getDayCellFactoryEndDate());
         end_datePicker.setEditable(false);
     }
 }
diff --git a/src/main/java/ch/zhaw/gartenverwaltung/TextFieldFormularController.java b/src/main/java/ch/zhaw/gartenverwaltung/TextFieldFormularController.java
index ebbbfe2..a53c240 100644
--- a/src/main/java/ch/zhaw/gartenverwaltung/TextFieldFormularController.java
+++ b/src/main/java/ch/zhaw/gartenverwaltung/TextFieldFormularController.java
@@ -1,6 +1,7 @@
 package ch.zhaw.gartenverwaltung;
 
 import javafx.fxml.FXML;
+import javafx.scene.control.Button;
 import javafx.scene.control.Label;
 import javafx.scene.control.TextField;
 
@@ -24,4 +25,8 @@ public class TextFieldFormularController {
     public String getValue() {
         return text_area.getText();
     }
+
+    public void initSaveButton(Button button) {
+        button.disableProperty().bind(text_area.textProperty().isEmpty());
+    }
 }