Roystonea regia seedling doesn't grow

[Than]

Anyone who has experience growing R. regias from seed, how fast do they grow? Mine sprouted about two months ago, unfurled the first leaf but nothing since. The leaf looks healthy. Is it too chilly for it to grow? Outdoors temperatures now fluctuate between 14C  - 21C or 57 - 70F. I put it indoors on a heat mat if the temperature drops below that. Humidity is at around 50-70%. It is in shade in a big pot and I water once a week roughly. Any thoughts?

 

 

[JohnAndSancho]

I always throw out this disclaimer that I'm not an expert, but it's likely working on pushing out its root system. Someone smarter than me will chime in. 

[D. Morrowii]

Also no expert but I have started quite a few of these from seed and they do seem to stall a little after throwing the first leaf. It seems like a lot of palms do this. What @JohnAndSanchois saying seems like a good explanation to me. As long as its green and healthy looking keep doing what your doing. The next leaves are on their way. Once they get going they get tall quickly!

[Than]

I guess it's a combination of factors. Developing a root system + the pot might be too short for the main root (someone told me they need very tall pots) + days getting shorter + temperatures not exceeding 70F.. 

I put it indoors on a heat mat and under grow lights and hopefully it will survive the winter and start growing from May onwards. 

Thanks for your input guys.

[GoatLockerGuns]

I have grown Roystonea regia a few times from seed.  My experience has been they keep their strap leaves for most of the first year of growth, and then start breaking out from there.  Of course, environmental conditions play a factor (i.e., light, temperature, humidity, watering, etc.); however, that trajectory has been pretty consistent for me.  I have one two year old Roystonea regia currently in a pot, and it is starting to push its third pinnate frond.  It did not push its first pinnate frond until about a year post-germination.