Columbia River Daylily Club


This is an article that was published in our Regional Newsletter and the CRDC Newsletter.  This is with permission from Dan Trimmer.



By Dan Trimmer

Water Mill Gardens

April 5, 2006

By formal education I should be qualified to discuss International Politics, but have zero qualifications to talk about any horticultural endeavors.  However, I have no experience in the political world, and I have about 25 years experience growing daylilies; in excess of 15 years as a commercial enterprise.  I’ve learned my lesions via the school of making more mistakes than I’d like to admit, and by asking as many people as possible to share what they knew, oftentimes via their formal education.  So here is a very quick overview of the lessons I have learned.


Number one is:  WATER, WATER, WATER.  If you do nothing else to your flower beds, which hopefully are filled with daylilies, provide at least 1 to 1-1/2 inches of water per week.  This is more important than any feeding program. 

Number two on the list of “things to do” is take PH readings in each of the locations where you grow daylilies.  Regardless of how much nutrition is present, not much is going to be available to your plants unless your PH is in the 6.2 to 6.8 range.  I’ve found inexpensive PH meters to be rather accurate when I compare them to lab tests of the same beds I’ve just tested with my el cheapo meter.  In addition to the accurate PH test the laboratory will provide for you, it’s important to get a baseline of what nutrition and element levels are present in your beds.  You can’t know what to add unless you know what you need.  County Cooperative Services may be able to provide this service to you at a very reasonable cost.  Amend as necessary to correct any PH problems.


Whenever possible incorporate as much organic material as you can get your hands on into your garden beds.  Compost, composted leaves, animal manures, cottonseed meal, corn meal, bone meal, and like will help keep your soil loose, provide valuable trace minerals and retain moisture.  This could be an entire article here, but I’ll stop here.

THE BIG THREE:  The Nitrogen Phosphorus, and Pot Ash that we see listed on the front of our fertilizer bags deserves quite a bit of discussion.  We must understand that our daylilies are not typical perennials.  With most of our flowering plants a “balanced” diet is recommended lest we get too much leaf and little bloom.  Thus 10-10-10 or 6-6-6- fertilizing programs are recommended.  This is not the case with Daylilies.  Daylilies are in the family of plants known as monocots.  They’re in the same plant family as ornamental grasses or corn!  Monocots prefer to feed at a rate of 3-1-2, or when in active growth 4-1-2.  Thus, 18-6-12 should be an ideal mix for us.  Compounding the typical lack of nitrogen problem my laboratory tests always seem to reveal is the fact that the middle number in our fertilizer (Phosphorus) is not easily soluble, while most of our nitrogen is quickly leeched away.  the bottom line is that if we do feed our plants year after year in the same beds, we may end up with much too much Phosphorus to the point where it is toxic.  Before this happens, and if your soil tests come back that you have adequate levels of Phosphorus, try feeding with small amounts of Calcium Nitrate (which will also help raise a low PH) or Ammonium Sulfate (which will help lower PH) and Potassium Nitrate throughout the season.  This will provide the nitrogen our plants like along with other valuable elements.  If you make a mistake, make it be putting out too little – not too much – of these products.  They can be very powerful and can cause severe burning.

Early in the growing season, in addition to the basic fertilizer regiment, it’s important to add what I’ll call the major minors:  Iron, Magnesium and Calcium.  Iron can come from an organic source such as Milorganite or an Iron supplement.  I get much of my Magnesium from Epsom Salts (which is Magnesium Sulfate at a rate of 100 pounds per acre), and additional Calcium from the earlier mentioned Calcium Nitrate.  Several professional horticulturalists have told me it’s important to get these “major Minors” out early in the growing season as they are required in order for the plants to be able to take up the Big Three (Nitrogen, Phosphorus, Pot Ash).  When I lived on Long Island, this active growth period started just after the dormants broke dormancy.  Following bloom season with the first cool weather in the early fall, was the second very serious feeding period.  It’s important not to use a time-release fertilizer at this time, as we want our rapid growth to end before the onset of very cold weather.  This second feeding period can result in twice the plant the following year as compared to unfed plants.  In Florida or the Deep South we can’t feed too much in the summer due to the excessive heat, so most of the feeding takes place from November through March.

I’ve found liquid feeding modest amounts of plant food very often to work wonders.  It’s also important to vary the product applied.  A Peter’s Excel product known as Cal Mag 15-5-15 seems to make my plants very happy.  (A lab test will also tell you if the important balance of Calcium and Magnesium is present.)  I liquid feed any number of other products, most with a very high first number (Nitrogen).

A last couple of thoughts.  Firstly, risk using too little fertilizer – not too much.  (Can’t say this in too loud a voice!)  Secondly, organic sources are better than chemical fertilizers, but for large gardens, we have little choice but to use the above-mentioned chemical fertilizers. 

My fertilization plan here in Vancouver WA.  Once again these are my thoughts.  I’m using three products.  Alfalfa Pellets, Milorganite, and Miracle Grow.  Early spring I broadcast Milorganite, followed by alfalfa pellets.  Once these are watered into the soil for a few months I spray Miracle Grow with a hose end sprayer. I have no “written in stone” schedule, just a general spraying for the entire garden.

MaryAnn Borcherding