Hi - My orchids need a bit of help - they're not flowering!!!!

[Nelly4]

Hi all

I first discovered orchids a few years ago when I purchased two from an Orchid show here in my local town in Victoria, Australia. They were dendrobiums and since then, they haven't flowered. I think I've done everything wrong but they are still here.

I since received another dendrobium from my father in law (its flowering now) and I am determined to keep it and try to help my other ones get better - that's why I'm here for help.

The weather in Australia is coming into summer so I have moved the orchids under my decking out of direct sunlight and heat. I am feeding them a fertiliser for growth as I assume that's what they need. Over winter, they suffered a bit in the frost and I think they were also damaged by the sun. Some of the leaves have black spots and I'm not sure what that is. My really big dendrobium had black patches on many leaves so I have cut those leaves off (is that the right thing to do?)

My question is - how do I take care of them over these summer months - how often to water or feed etc?

I have posted some pictures of my orchids so you can see what I have and I'd love to know how to care for them better. Thanks in advance - I don't know what the first tall orchid is but I think its probably dead?
Janelle