Question
I don't know the name of the plant...it has a thick stock and large leaves...It's now more than five feet tall and has outgrwon it's ability to support itself. MY father (who gave me the plant) put a shovel handle in it as a stake, but it's even outgrown that. My roommate said to replant it deeper, but I'm not sure how safe that is for the plant. It's currently in a large self watering planter (maybe 20" across). Any suggestions?  

Answer
Hi Dheana,

I suspect you may have a Dieffenbachia, although I cannot be sure without a photo. If you would like, you can e-mail a photo to me at my address below.

Dieffenbachias are notorious for growing ever-taller until their stems can no longer support them without leaning over or snapping under the weight of the large, heavy leaves.

Replanting will not work. In fact, adding moist soil higher on the stem will cause the stem to rot and then you will lose the whole plant.

The only long term solution is regular pruning. Here is how it works.

The stem can be cut off at any point from a few inches above the soil to close to the top. Just keep in  mind that the new growth (leaves) will emerge on the stem just below where you make the pruning cut. It is generally best to prune it back pretty far. That way you will get new leaves close to the base of the plant and your plant will have lots of space to grow before it gets tippy again.

The part that you prune off can be rooted at the base of the existing plant or in a separate pot filled with moist potting mix. With a 20" pot you have lots of room to add additional stems.

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

You can E-mail me directly at: [email protected]

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