My 1st Mounted plant

[esungirl]

I found this wood at the Salinas Riverbed, it's actually hollow inside the base, and had a nice lead for a plant to grow up on it. It's and Onc. flexuosum. It's been mounted for about 3-4 months but not really growing to vigourously. I try to spray it 2 x a day and thoroughly water once a week. Any other suggestions to help him get going, there are 2 new growths on it. But the growth is at a snail pace.