Quote:
Originally Posted by bonmonamie
The fertilizer I used once was 30-10-10 and one of the ingredients it is derived from is urea.
The pot looks ceramic with one hole at the bottom for drainage.
The potting medium is bark mixed with some type of dried leaves/plants that are tan colored ? (I'm sorry I don't know what it is called).
The roots are white and I can see a few at the bottom when I remove the plant from the pot.
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One hole does not provide enough drainage for an orchid and glazed ceramic does not breath. The stuff mixed in with the bark might be sphagnum moss. Sphagnum has a tendency to get compacted and it holds water for a long period of time. This situation would suffocate/drown the roots.
It's probably that you and your brother need to repot your plants. You shouldn't need anything larger than a 4" orchid pot because Dendrobiums grow better when pot bound. Make sure to use a ventiliated pot designed for orchids. Lowe's and Home Depot carry terracotta orchid pots. They are designed with open slits in the sides in addition to the drainage hole in the bottom. There are plastic orchid pots on the market but they are difficult to obtain in emergency situations. You usually have to order them from an on-line vendor.
When you remove your orchid from it's pot you'll need to inspect the root system. The mushy dead roots need to be removed before repotting. It's important to leave the shriveled canes on your plant. They might look ugly but they will continue to supply energy for new growth.
Use a potting media that promotes drainage. Medium grade coconut husk chunks or bark, charcoal, and aerolite or pearlite works well for me. You should pre-soak the new media for several hours before using it.
Once the plant it repotted avoid watering it for a few days and gradually, gradually introduce it to increasing amounts of sunlight. Too much sun will burn the plant.