My Neos are not blooming am I doing it right?

[fooferdoggie]

they seem to grow best in jars like my vandals. they get a fair amount of sun and less though the are shorter then the vandal so I wonder if they are getting enough. they get a overnight soak twice a week one with a tablespoon per gallon of fertilizer. My vandals do well with this light and watering and bloom well .but these guys grow well but I don't think have re bloomed one every few months.