Why Doesn't My Philadelphus Flower?

Like lilacs, mock orange should be pruned right after flowers fade. Pruning too late in the season can cut off next year's buds. ... Improper fertilization can also be a reason why a mock orange bush does not bloom. Too much nitrogen from lawn fertilizers can cause a mock orange to grow large and bushy but not flower.

Why does my Philadelphus never flower?

The most likely cause of mock orange failing to flower is pruning at the wrong time of year. ... If you prune too late or too early, you risk cutting off the stems that would have flowered.

When should Philadelphus flower?

They are deciduous (loose their leaves in winter) and produce their flowers for about five weeks in mid June to late August depending on local conditions.