diff --git a/homeassistant/components/plant.py b/homeassistant/components/plant.py
index 2215d7c2f30..2070c22fb97 100644
--- a/homeassistant/components/plant.py
+++ b/homeassistant/components/plant.py
@@ -58,8 +58,8 @@ SCHEMA_SENSORS = vol.Schema({
 PLANT_SCHEMA = vol.Schema({
     vol.Required(CONF_SENSORS): vol.Schema(SCHEMA_SENSORS),
     vol.Optional(CONF_MIN_BATTERY_LEVEL): cv.positive_int,
-    vol.Optional(CONF_MIN_TEMPERATURE): cv.small_float,
-    vol.Optional(CONF_MAX_TEMPERATURE): cv.small_float,
+    vol.Optional(CONF_MIN_TEMPERATURE): vol.Coerce(float),
+    vol.Optional(CONF_MAX_TEMPERATURE): vol.Coerce(float),
     vol.Optional(CONF_MIN_MOISTURE): cv.positive_int,
     vol.Optional(CONF_MAX_MOISTURE): cv.positive_int,
     vol.Optional(CONF_MIN_CONDUCTIVITY): cv.positive_int,