Should I start to water my catasetum Type orchid?

[H.D]

Thanks!
Sadly i really don't know how long are the roots. I had read all weird things like wait till the roots fill the ENTIRE POT !!!! but i don't think that is happening anytime soon lol. i think it would be best to wait atleast one more week as roberta says.

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Thanks Roberta!
your website is wonderful! i was wondering if you have any schoenorchis varieties? i ordered a scolopendria just today!!!!