Sometimes, if you haven't watered for awhile, the soil no longer absorbs water - it runs right through the pot without soaking the soil. If the soil doesn't hydrate, watering is pointless. The only way you will know for sure is to water and then wiggle your finger into the soil and make sure its wet 2 or 3 inches down.
If you discover the soil is not absorbing moisture, try watering 3 times (wait 5 or 10 minutes between). If that doesn't work, soak the entire pot up to the rim.
