Oncidiums will bloom from more or less matured new growth. I see only old pseudobulbs and one small new growth on your plant. That partucular young growth will grow large ( like 7-9") and than roots will start to grow. They (roots) will grow long and better for them to get into potting mix ( not hang outside). And only after that new rooted growth will produce a spike. New pseudobulb will be like "half dressed", or some people call it stage " shoulders", not fully formed bulb yet. However, if orchid doesn't have enough light or nutrition it will produce next new growth at once, without stopping and blooming.

Okay thanks for all the info. I wrote another post titled similar to this about a month ago. Could you read that one and comment your opinion on what their thoughts were so I can see how I need to makes sure my Oncidium is prrepsring for blooming

But if you don't have time I understand. When I have timd tomorrow I can search for if a paste it into this discussion thread

I looked on your posts, but dont see other post about oncidium. What did you ask?

Watering once every two weeks seems too infrequent. My oncidiums prefer being damp. In the summer I water more like twice a week. And they definitely want a temp drop to bloom. Mine just started putting out flower spikes last week and I had been leaving the windows open for nights around 65-60 degrees for several weeks. You might just need to wait while it gets cooler in your house for a longer period of time.

I water mine every day. But I use terra cotta pots and lava rock medium. They like to get wet and need to mostly dry between waterings. In general with tropical rainforest orchids you get the most out of the plant by providing frequent cycles as that is what they get in their natural habitat...In plastic pots and/or medium that holds water this method would kill the plants. I mount orchids too. I also grow them on trees in my yard.

I like lava rocks as well. My iwanagaras loved them! I just don't know good way to make rocks smaller. I will appreciate any advise! Hammer is out of question!

what size are they now? Some garden centers sell loose and 40lb. bags for $7. I'm in Florida and the rock comes from Colorado. The ones I use are around 3/4" in diameter plus or minus...

Mine are pretty big. We dont have anything smaller then 0.5-1" in diameter. I already took from the bag all small ones ( for my two iwanagaras and for bottom drainage). Just big chunks are now left. I tried hammer them, but I'm having troubles doing this, hehe. Bag is big but not 40 pounds.

Where do you live?

Alaska

If getting lava rock is difficult then can you find gravel rocks around 3/4" to 1"?

Thanks guys. The temp is down to 45°. Startedast night and now again tonight. Just a cold front in from Canada. It's going to be in the 60s every night now until mid November when it gets chilly. I'm in Savannah ga. I water the Oncidium when it starts to get dry. Like I said, I mist it in between waterings. Do you guys think it will shoot a spike soon??

Try looking for a supply source that sells hydroponic supplies; they carry small clay nuggets that are used also by orchid growers and provide excellent drainage with a slight moisture retention or expanded/shattered shale product pieces are small 1/8 chips that is produced in NC and is sold as a vole/mole deterrent.

Carter & Holmes sells a cedar bark mix that is mixed with large perlite nuggets that is IMHO good for fine brittle roots like oncidiums. The cedar is in long slender strips 2-4 inches long and mesh well with small roots like holding you fingers closed when praying. Also good is Orchiata mix seedling (smallest size) bark which does not need to be amended with additional products and lasts longer than most other bark though more expensive.

I grow mine in small bark mixed with some sphag and perlite. They do not like their roots to dry out.

I live in Florida, they grow outside and get rains and I water when they are dry.

The trick with them is to give them sufficient light and do not let them dry out. A SE window should work. You might have a summer bloomer.

Did you repot it? This is not the best time to repot, but if you see signs of new growths, I would repot now. Otherwise, wait until Feb/March to repot.

Your plant looks healthy but does need repotting.

Jane