I thought mine was stalling too.... The spikes grew but no flowers developed for AGES! I got quite worried its my first Onc. and first spikes
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I decided maybe it was water as she's a thirsty one compared to Phals etc. so I tried soaking for an hour at watering times in a bloom fertiliser to give it time for a good drink, and saw growth renew within a week!
Whether it's the ferts, the watering time or just the weeks and weeks I watched it doing nothing before this I'm not sure
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but within 3weeks of changing my habits I'm waiting for flowers to uncurl any day now.
Just make sure it's not still too wet before u water it again each time
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