NY Finger Lakes 2019 Black Walnut Yield: Down But Not Out

It was late July, 2019 and a normal Finger Lakes summer. The water temperature in Seneca Lake had morphed from threatening into almost pleasant, a handful of boats were out on the water and, for the first time, we were busy readying Black Squirrel Farms to accept black walnuts for fall processing. Our 2019 plan was to grow and process the black walnuts from our 80+ trees on 590 State Route 14 and collect and process black walnuts from other area growers. We were so focused on what was happening on the ground that it took us until July to notice that this year our trees didn’t seem to be growing black walnuts.

Our trees looked healthy, with green leaves and no obvious widespread insect damage so we ruled out an unidentified infestation or disease as the likely cause of our production deficit. We opened some early-falling walnuts and found partially formed shells and black glistening masses instead of nutmeat. Underdeveloped walnuts falling early can indicate insufficient pollination. While there are many ways pollination can go wrong, most are related to weather and the weather irregularity most likely to cause widespread loss is temperature. Spring temperatures below 26°F will kill emerging buds and destroy catkins and pistillate flowers.

A review of Penn Yan airport weather station data revealed that exposure of our trees to temperatures of 26 F or below could have happened as late as April 29, 2019. This is unusually late for temperatures this cold. Logically, if the April 29 cold snap caused our walnut deficit, other area growers would be similarly affected. To test this, we reached out to regional black walnut growers in late July and early August. The map below compares black walnut yield estimates from these growers with the April 29 temperature lows from NOAA monitoring stations. Without the benefit of sophisticated climate modeling to guide us, we crudely defined two areas probably exposed to temperatures cold enough to damage vulnerable non-dormant black walnut tissue on April 29.

Figure: April 29, 2019 Low Temperatures and 2019 Black Walnut Yield at Selected Sites



It’s not clear that sites within this cold exposure zone on fared significantly worse than sites outside this zone. “Maybe a little” is a fair response to that question. It does appear that sites nearest the largest and the deepest of the Finger Lakes, such as ours, fared demonstrably worse.

Even if it the cold temperatures on April 29 did inhibit 2019 black walnut yield, how that happened is likely not as simple as “our blooms froze”. We couldn’t find many reasons to believe that our trees were blooming on April 29 and we hadn’t been monitoring our trees. The information we found signaled that a mid-May bloom date is most likely for our site. For example, a still-cited 1915 article indicates that black walnut trees flower in early April in the southern portion of their North American range then progressively closer to the beginning of June at northern sites like ours. In contrast and confusingly, Wikipedia suggests that black walnut budbreak travels north to south, governed by a 14-hour day length requirement for leafout. Interestingly, this implies first leaves by the end of April and blooms in mid-May for our site. Some excellent 2002-2006 work done with multiple cultivars in New Franklin, Missouri reveals a preponderance of mean pistillate flower bloom dates in mid-May. Both our site and New Franklin, Missouri are in USDA plant hardiness zone 6a, so this study signals mid-May blooms for our trees by analogy. Certainly, trees experience annual variability in bloom date. While we don’t know how much annual variability is normal for black walnuts, the well-documented long-term bloom history of Washington D.C.’s famous cherry trees shows that while cherry tree peak bloom dates often vary by more than two weeks from one year to the next, peak bloom more than ten days earlier or later than the long-term average is possible but unusual. Earlier blooming in recent decades has been widely noticed for many northern plant species but the New Franklin work is recent enough to have inherently taken this into account. This information taken together makes it seem implausible that our black walnut trees were blooming in late April and therefore had blooms susceptible to the cold snap.

Do black walnut trees near the largest and deepest of the Finger Lakes bloom earlier or later than other Central New York black walnut trees? Could our trees have lost their first set of emerging leaves to cold and then, rather than expend already-depleted starch reserves on a nut crop, used their depleted energy supplies to create another set of leaves? Our takeaway is that until we can observe black walnuts growing, it makes sense to assume that the scale of that year’s black walnut crop is unpredictable. Year to year variability in local and regional black walnut yield is almost certainly driven by more than just the alternate bearing nature of the trees. We are responding to this year’s disappointing yield by deferring some of our 2019 plans until 2020 and moving multi-year black walnut storage capability from our “nice to have” to our “need to have” column. Perhaps the science enabling us to predict black walnut yield earlier than a few months before harvest will emerge but until then we will treat an unpredictably fluctuating crop volume as just another known business challenge.

A toilet cleaning fairy tale

Once upon a time, there was a home with a toilet. That toilet needed occasional cleaning. This was a job none of the good people who lived in the home really wanted to do. Then, from the depths of the supermarket aisle for cleaning supplies, a hero arose to take on that very challenge. Just by squirting it on or letting it fizz or dropping it in the tank, this hero would cling/foam/dissolve/shine/coat/disinfect/deodorize to bravely fight toilet-dwelling life forms and stains of all origins, leaving the bowl sparkling clean for the good people of the home. The battle line between good vs. evil was drawn and the enemy was beaten back to a position of retreat located somewhere downstream of the flange in the bathroom floor. Our hero was victorious and is happily affordable enough to be with the good people of the home forever after.

And that’s the end, right?

This compelling story has been told many times. However, one feature of stories is that they often require the listener to suspend disbelief in order to enjoy the story. What realities lurk uncomfortably behind the scenes? It’s time to have a look at some of the plot holes.

Plot hole #1: The toilet (or toilet seat) is the grossest, dirtiest thing in the house and therefore fighting that monster with the more powerful weapons available makes sense.

A lot of work suggests that toilet seats are generally quite clean compared to household items like toothbrushes and toothbrush holders, bathmats or (possibly the worst), used kitchen sponges or dishrags. Interestingly and arguably, one of the most effective steps that can taken to minimize the spread of household toilet-related germs is to flush with the lid down and then lift the lid back up to let it dry post-flush. Flushing makes a small fraction of toilet water go airborne and toilets are most often flushed when their contents are less than pristine. How tough the bad guy in our story is may not be related to how tough the bad guy looks.

Plot hole #2: Potent chemicals either disappear or become harmless once flushed and so our hero will never become a villain.

Our story doesn’t state this but it is implied. Most chemicals capable of harming or killing life don’t stop being chemicals capable of harming or killing life just because they happen to be flushed down a toilet. Perhaps instead of a good guy/bad guy story, the more honest tale would be that of Dr. Jekyll and Mr. Hyde – the same character with a dual good and evil nature. Check out what the Environmental Working Group has to say about the product you are using now. Over half of the toilet cleaning products on the market score an “F” on their hazard rating scale.

Plot hole #3: Our hero is simple and well understood.

Because of trade secret protection laws, cleaning product manufacturers don’t have to list all ingredients on their label (although some manufacturers commendably do). What is federally required is that household cleaners containing chemicals of known concern name those specific chemicals on their label and include a warning detailing associated risks plus caution statements and first-aid guidance. What if a chemical concern isn’t known? Much more testing has been done to assess risks from acute versus chronic chemical exposure as well as quantify hazards associated with single chemicals versus chemical combinations. The hero of our story is more complicated character than portrayed.

We’re telling a different story. The composition of our toilet-cleaning product isn’t a trade secret – we make our product using baking soda and black walnut shell powder. Our product includes no fragrance of undisclosed origin and no disinfectant. Finely ground black walnut shells act as an abrasive hard enough to effectively clean but soft enough to not scratch porcelain and concurrent scrubbing with an abrasive enables a mild, non-toxic cleaner like baking soda to be more effective. Our product is intended to be part of an integrated cleaning regimen, not a solution for everything. For those who have taken control of their home cleaning routine to such a level that they make their own cleaners, we offer black walnut shell powder as a separate ingredient. There are no plot holes in our story about offering a non-toxic septic-safe aquatic-life-friendly toilet cleaner which includes a biodegradable abrasive made from 100% American-grown black walnuts. We believe that people should know all the ingredients in the household cleaners they are using so that they can make informed choices regarding how they want to clean their home. It’s easy to learn about us. We aren’t complicated and we believe that the more people get to know us, the more they will choose to work with us – and that’s our happily ever after.


Can I put black walnut shells in my recycling bin?

What should go in recycling bins is exactly what the destination facility knows how to process. If the facility receiving the recycling bin contents only knows how to process cardboard, newspaper and aluminum cans and instead they receive coat hangers, those coat hangers are no longer coat hangers but rather “contaminants”. Contaminants are generally diverted to a landfill.

Of course, those same coat hangers holding up clothes in a closet aren’t contaminants. When they are doing their job, they’re coat hangers. Just like some people say that a weed is a plant out of place, waste can be a resource out of place.

At Black Squirrel Farms, we have some ideas about how black walnut shells can be a resource and not a waste and we are proving it by bringing new products to market. Check out our store. Alternatively, consider upcycling black walnut shells. Search on “sliced black walnut shell art” and be amazed.


Are black walnuts and English walnuts different and do English walnuts come from England?

It’s likely that when someone says “walnut”, you imagine an English walnut. The walnuts sold in grocery stores are mostly English walnuts. Black walnuts are available for sale but they are hard to find. Black walnuts and English walnuts have different flavors and shapes. Black walnuts have a bolder taste, with more fruity and musty flavors than English walnuts. The strong flavor makes black walnuts a more attractive ingredient nut as opposed to a snack nut. The less earthy flavor of the English walnut has broader appeal and English walnuts make a great snack. English walnuts have thinner shells that are easier to crack with a higher nutmeat/shell ratio (more meat per nut).  English walnuts are more easily shelled at home with a hand-operated cracker.


Both kinds of walnuts are really healthy foods. Walnuts contain alpha-linolenic acid (ALA), the plant-based source of omega-3 fats. Both kinds have been found to contain phytosterols, a cholesterol-lowering agent. Walnuts are low in saturated fats and high in fiber. Proportionately, English walnuts may have a little more omega-3 than black walnuts but not as much arginine and selenium. There is no wrong answer when trying to choose the healthiest kind of walnut.

Black walnuts are native to North America. But are English walnuts native to England? As it turns out, English walnuts grow in England but that’s not where the tree originated and English walnuts are not a major English commercial crop. The tree originated in the Middle East and the nuts are called English walnuts because historically the English merchant marines would trade them around the world; the nuts became commonly known as English walnuts. The English walnut and the Persian walnut are the same walnut.

Black walnuts are an heirloom American ingredient. Because they have a different flavor than English walnuts, they cannot be substituted 1:1 in recipes calling for walnuts without affecting the recipe outcome. Heirloom ingredients may require heirloom recipes or the creation of new recipes. Here’s a fun example from Sheryl Lazarus, who posts and tries family recipes from a hundred years ago and has noticed that trying these recipes has caused her to eat healthier foods made with local, seasonal ingredients.  Got your own heirloom black walnut recipe over 100 years old?  Please contact us to share.