Slow growing washingtonias

[NC_Palms]

Do heat and humidity slow down the growth of washingtonia robusta and filifera? I germinated both washingtonias last winter and they did fairly well until I moved them into a poorly aerated greenhouse stand last spring. Since then both washingtonias have been constantly browning at the leaves and haven't grown past the seedling/grasslike stage all summer. 

[Palmcycasnut]

They love all the heat u can give them but not constant humidity.  

[NC_Palms]

4 minutes ago, Palmcycasnut said:

They love all the heat u can give them but not constant humidity.  

That may explain it. It is humid 24/7 in NC, and since Florence ended, the filiferas are looking worse.  

[TexasColdHardyPalms]

I've never heard of a slow growing filifera or robusta. These grow in central Louisiana and south texas and no part of north Carolina is hotter or more humid than that so you're grasping at straws on that theory. Im guessing it is far too bright in your house and you dont have any shade cloth over them, which will slow them down. Pictures of your setup will help. 

[NC_Palms]

On 9/20/2018, 6:18:45, TexasColdHardyPalms said:

I've never heard of a slow growing filifera or robusta. These grow in central Louisiana and south texas and no part of north Carolina is hotter or more humid than that so you're grasping at straws on that theory. Im guessing it is far too bright in your house and you dont have any shade cloth over them, which will slow them down. Pictures of your setup will help. 

Would partial shade work? They were in full sun outside.

[TexasColdHardyPalms]

Yes, partial shade will help a lot. Full sun outside was hurting them.