Cattleya skinneri var alba

[Henke]

Our cattleya are setting spikes we think. We can see the spikes within a thin "bag". Its as thin as you can look through it almost.

Now my question. There are 2 of thoose bags. One is green the other one is getting browner by the day. Is this a step in the process for it to bloom or is there something wrong?

If something is wrong what can we do to prevent the green one from getting brown too?

I can add that it looks like the thing inside the bag is growing.

Attached are some pics of the bags....

Regards
Henke

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