Want to learn more about Plant Symptoms - No Flowers
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WHY DOES THIS HAPPEN
There are a few different reasons why your plant may not be flowering - sometimes this is totally normal, and other times it may be a sign of inadequate conditions for flowering even though your plant is healthy and grows well.
It takes a lot of resources for a plant to produce buds, flower and later produce seeds once pollinated. One explanation for no flowers might be that your plant isn't getting enough light, or nutrients.
Some plants experienced marked periods of dormancy, so during these times, you don't need to worry about your plant flowering. This is the case with moth orchids (Phalaenopsis). They usually need a longer period of bright indirect light and regular additions of nutrients to put out a flower spike. After that they take a pause to collect more resources before flowering again.
There are many different flowering plants in the world and some species needs specific conditions met to initiate flower production. To those that keep on flower regularly, lack of flowering is usually due to underfertilizing, low light or irregular watering.
If you're unsure of which particular problem may be causing this symptom in your plant, you should take a look at its overall health and see if it's showing any additional symptoms. Lack of nutrients usually shows as paler and somewhat stunted new growth. A plant lacking enough light might be slightly etiolated and a plant that gets irregular watering might have leaf damage.
If your plant seems generally healthy and happy, you should check to see if that particular species needs some special condition to start flowering. Some plants need a cool or dry dormancy, others needs shorter days, higher humidity or higher temperatures for a period of time.