Hi @Ellie2,
Orchids can sometimes be finicky when it comes to blooming. If your orchid has buds that are not opening, and one has recently turned yellow and dropped off, this could be a sign of a condition known as "bud blast." Several factors could be contributing to this issue.
One common reason is inadequate light. Orchids need bright but indirect sunlight to thrive and produce flowers. If your orchid is placed in a spot with low light, it may develop buds but lack the energy to bring them to full bloom. Ideally, orchid leaves should be a light to medium green; darker leaves often indicate the plant is not getting enough light. Moving your orchid closer to a bright window, but out of direct sunlight, could help.
Temperature fluctuations are another potential cause. Orchids prefer consistent temperatures and can be sensitive to sudden changes. Exposure to cold drafts, heaters, or rapid shifts from day to night temperatures can stress the plant and lead to bud loss. Try to maintain a stable indoor climate, ideally keeping daytime temperatures between 21–29°C and nighttime temperatures between 16–21°C.
Watering practices also play a crucial role. While you mentioned watering regularly, both overwatering and underwatering can be harmful. Overwatering can lead to root rot, depriving the plant of nutrients, while underwatering can cause dehydration. The key is to water thoroughly but allow the potting mix to dry slightly before watering again. If your pot does not have adequate drainage, this could be playing a major role.
Does your pot have drainage holes?
If not, I'd suggest repotting your orchid in a self-watering pot, which will keep the water in a reservoir at the base of the pot so the orchid can wick water from it when it needs it.
To summarise, you need to make sure your orchid is getting enough light, is not in an area where the temperatures fluctuate greatly and ensure your orchid is getting enough, but not too much water.
You might like to have a look at How To Plant, Grow And Prune An Orchid and How To Grow A Phalaenopsis Orchid for some further guidance.
Let me know if you have any further questions.
Jacob
