Hi trace25,
As mentioned by Zoi2, this is natural as the blooms don't last forever, and, indeed it could have been caused by a change in its environment as it was transferred to you from the previous owner. Going forward, here are a few basic tips for you.
Avoid moving the phal to different sites in your home as it will thrive best in a settled position. Don't be tempted to stand your Phal outside, even on a hot day. They require as much light as possible, but not direct sunlight. West and east facing window sills are especially suitable. The strong sunlight can cause scorching of the leaves and flowers, leaving unsightly brown spots on the leaf surface. If using a sunny facing sill, some shading (such as sheer or net curtains), is really beneficial for the phal in the summer months.
Keep an eye out for sudden cold or frost - as it can cause problems. Move the phal away from the glass on frosty/cooler nights.
The best temperature for your phal during the day is at least 64F, 18c. In the summer it will thrive with warmer temperatures.
Night time and winter temp should not fall below 55F. A difference of around 9 degrees F between night and day temperature is needed to stimulate flower growth.
Again, as mentioned by Zoi2, root care is so important. Never allow water to "pond" at the bottom of the pot as this will cause the roots to rot. Humidity around the phal is required and can be achieved by standing the orchid pot on an upturned saucer or dish in a shallow tray of water filled with pebbles or similar medium.
Misting leaves occasionally, using a very fine spray with water at room temperature, is beneficial, but do not over wet them.
Misting also discourages pests that thrive in dry air, such as the red spider mite. Cleaning foliage with a damp sponge weekly will remove dust and also help to deter pests by removing them and their eggs.
In terms of watering, don't allow the (bark) compost to completely dry out. Always allow the compost to be semi dry before watering. This is usually every seven to ten days depending on the season. As its a new phal for you, familiarizing yourself to the weight of the pot before and after watering will help you to determine if your plant needs water in the future. Do ensure your water is at room temperature as cold water can also lead to bud drop. when watering, pour it through the compost (avoiding the leaves) , drenching it thoroughly. Ensure you don't leave water in the leaf axis (crown of the plant) as this will cause rotting of the plant. Allow the water to completely drain from pot, around 20 minutes, before placing it back in its original position. You'll learn things as you go along - a sign of overwaterng is a wilting phal, and your leaves will appear crumpled.
Good luck
- you have a beatuiful looking phal.
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