Question
Hi Will,

I have a North Fork Pine that I think is getting too big for the pot it is in.  I would like to know how to determine is this is correct and if so the proper procedure to split the plant and replant it in two pots.

Also, I read before that someone keeps the plant outside in the summer.  What type of temperature does the plant need to thrive?

Thanks,

Rachel

Answer
Hi Rachel,

Norfolk Island pines rarely outgrow their pots although they often look like they may be too big for their pot. Here is the best way to tell if it is so rootbound that it would benefit from a larger pot:

Water your tree thoroughly so the entire rootball is saturated. Then wait for the soil to dry out a quarter of the way down into the pot. If it takes three days or less for that to happen, then it is ready for a pot one size larger. Otherwise, leave it in its existing pot.

I do NOT recommend that you separate your NIP by dividing the roots. Cutting through the rootball is often traumatic to the tree and you risk losing it. There is little to be gained by dividing it. If you decide to do it anyway, then use a sharp, strong knife to slice straight down from top to bottom of the rootball. Then place each half into the same sized pot it is now in and fill it in with a good potting mix.

Likewise, moving it outside in the warmer months is also somewhat risky as sudden environmental changes (light, temperature, wind) can stress the tree and cause some of the lower branches to yellow. If you do move it outside, wait until nighttime temps are above 55 degrees and be sure to keep it shaded from any direct outdoor sun and protected from strong winds.

Please let me know if any of this is unclear or if you have any additional questions.
   
Regards,
Will Creed, Interior Landscaper
Horticultural Help, NYC

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