Now’s the time to be proactive about poinsettia nutrition

If you’re producing poinsettias this year, you are probably just about finished with potting up your newly rooted cuttings. Keeping an eye on your crop throughout the production cycle will help to identify problems early, and allow you to correct the problem before it gets out-of-hand.   Consider this blog post your “cheat sheet” on identifying poinsettia nutrition related disorders.

Common deficiencies are more likely to appear in mid-fall, but in order to head them off it’s important to keep track of your E.C. and pH levels now. For best results, maintain a feed E.C. between 1.0 and 2.5.   Higher E.C. values will allow salts to accumulate, which will inhibit nutrient uptake.  High E.C. can also cause young roots to burn – which provides an entry point for root rot problems.  An optimal pH is in the range of 5.8-6.2.  A pH greater than 6.5 will stunt growth, and iron deficiencies will eventually occur.  Bi-weekly testing of these indicators and keeping good fertility and spray records can help you to understand what type of corrective action to take if a problem arises.

Common nutritional problems of poinsettia. Problem photo credits: Brian Whipker (NC State University).

Common nutritional problems of poinsettia. Problem photo credits: Dr. Brian Whipker (NC State University).

As with any nutritional problem, symptom location can help to narrow down the culprits.  Symptoms in the older, more mature leaves are typically caused by nitrogen (N), phosphorus (P), and/or magnesium (Mg) deficiencies.  Symptoms in new or younger growth suggest micronutrient deficiencies such as calcium (Ca), iron (Fe), sulfur (S) or molybdenum (Mo).  The infographic above includes pictures of typical symptoms of these deficiencies.

Remember that a few single or grouped symptomatic plants typically suggest a pathogen or pest problem, while widespread symptoms suggest nutrition issues.

Interested in more general nutrition information?  Check out this refresher.

This entry was posted in Plant nutrition, Plant production, Poinsettia and tagged , , , , . Bookmark the permalink.

One Response to Now’s the time to be proactive about poinsettia nutrition

  1. Pingback: Fainting “Freedom Red”? Wilting “Whitestar”? Potential causes of Poinsettia collapse, solutions, and the importance of testing. | onfloriculture

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