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Andy Lopez, Contributing Columnist/Invisible Gardener
1:54 pm PDT June 9, 2014

This is continued from my last article on hard pan in Malibu and what to do about it. 

Start the drip time at 30 minutes and watch to see if the tree vents start to over flow or if the water seeps down. 

In a hard pan situation, the water will just sit there and never seep down. You should therefore get a rod and stick it into the tree vent, going down as deep as you can, say three feet. 

This is a slow process because the soil is going to be very hard and will need time to soften up.