Short spikes on multiflorals

[lienluu]

So I've noticed this year that all my multiflorals are blooming on very short spikes. No culture change really from previous years, though I guess I did keep the greenhouse about 10 degrees warmer this winter than in the past.

Any ideas on what may have caused that?

 

[jtrmd]

I notice the multis in the brighter part of my GH have shorter spikes.Are your plants getting more light than previous bloomings?