Assuming the plant is getting appropriate sunlight, a lack of flowers commonly occurs when a morning glory is growing in soil that is too rich. High levels of nutrients (such as nitrogen) can cause the plant to grow more foliage and vines at the expense of flowers. On the bright side, if you keep planting morning glories in the same spot, they will keep using up the nutrients and, ironically, start to bloom better!
Assuming the plant is getting appropriate sunlight, a lack of flowers commonly occurs when a morning glory is growing in soil that is too rich. High levels of nutrients (such as nitrogen) can cause the plant to grow more foliage and vines at the expense of flowers. On the bright side, if you keep planting morning glories in the same spot, they will keep using up the nutrients and, ironically, start to bloom better!