What causes phalaenopsis orchid bud blast?

Hey folks, today I'm showing you a Phalaenopsis Moth Orchid with bud blast that I bought marked down on sale from Waitrose. The flower buds are dead or dying and I thought this would be a good opportunity to show you how I inspect the roots, repot and discuss the various causes of bud blast. Hope this helps some of you! Follow me on Instagram: https://www.instagram.com/emmasindoorjungle/