PINING FOR PINES

More Than Just Pignolis and Piñons

Pine trees first appeared on earth 170 million years ago amidst lush, steaming forests of tree ferns and the footprints of dinosaurs. In time, human footsteps replaced those of the dinosaurs. Pines and humans have been intimately associated ever since. The trees have been worshipped; the cones have represented symbols of fertility; the pitch has sealed ship hulls; and the wood has been used for construction and for paper.

Korean pine

Korean pine

Throughout this long association, seeds of certain pines have been part of our diets. The flavorful seeds of native pines have a long history of use as “nutmeat” by the people of Siberia, the Himalayas, southern Europe, and the American Southwest. Look into almost any Italian grocery store in America, and you’ll find tempting cookies studded with pignolis, which are seeds of the Italian Stone pine (Pinus pinea). Pine nuts are the nut for pesto and dolmas. And from the American Southwest come seeds of the piñon pine. 

Although pine nuts usually are associated with the dry, mild climates of Southern Europe, the American Southwest, and northern Mexico, there are pine species that will produce edible nuts outside of their native range — even in the humid, often frigid, climate of my farmden. Nut-producing pines run the gamut from scrubby shrubs to majestic trees, some with needles that are soft and misty, others with needles that are dark and somber.  

Korean pine (P. koraensis), Swiss Stone pine (P. cembra), and Siberian pine (P. sibirico) are the three most reliable nut-producers for cold climates. All are hardy to at least minus twenty-five degrees Fahrenheit. The Korean pine is the most commercial of the three, producing 5/8-inch-long seeds that are exported from China. The tree itself will eventually tower to a soft, dark-green pyramid of 150 feet. 

Swiss Stone pine finds a congenial home in the small garden, eventually reaching 50 feet or more, but very slow-growing. Native to central European Alps, this pine has dark, almost blackish-green, needles that, with the short branches, seem to hug the trunk. The Siberian pine is similar, except faster growing.  

Swiss Stone Pine

Swiss Stone Pine

Many other pine species potentially could produce pine nuts outside their native range, though their adaptability to very cold winter climates has not been not thoroughly tested. The closely related Colorado Pinyon (P. edulis) and Singleleaf Pinyon (P. monophylla) pines are bushy trees that become flat-topped with age. I planted a Singleleaf pine years ago; it’s annual growth was measured in inches. With the slow growth and lack of nuts, I eventually tired of it.

One of my favorites, unfortunately not hardy below 10°F, is the Digger (P. sabiniana). I saw many of these trees years ago as I was driving west down from the Sierra Nevada mountains; I came screeching to a stop when I spotted one of the large cones lying near the road. Passing motorists might have taken me for a lunatic as I tried to smash open the coneby smashing it repeatedly on the guardrail. This species bears lima bean sized pine nuts.

Some other pine species producing edible, albeit small seeds, are Himalayan pine (P. wallachiana), Limber pine (P. flexilis), Jeffrey’s pine (P. jeffreyi), and Japanese Dwarf Stone pine (P. pumila).

My Personal Pinetum

I’ve entered the world of nut pines with some plants here on the farmden. I began, of course, with Korean pine, but can’t claim great success. My largest tree, now about 35 feet high, has occasionally produced a cone near its summit. Perhaps some squirrels got them; I didn’t. The tree is a dead ringer for our native white pine (Pinus strobus); the most direct way to differentiate the two would be from the Korean pines cones, which are about half the length (about 4 inches) of white pine’s cones.

My older Korean pine

My older Korean pine

Just this year I purchased two more Korean pine seedlings. They’re each only a few inches high now, and I hope they bear like a friend’s Korean pine, which was loaded with cones when a mere 6 feet in height.

My younger Korean pine

My younger Korean pine

I’ve also planted a lacebark pine (P. bungeana). Besides offering pine nuts, the bark of this pine flakes off to yield pleasing patterns similar to that of sycamore. Neither nuts nor flaking bark here yet, though.

Lacebark pine

Lacebark pine

 Care and Feeding

 Nut pines, in common with most other pines, require little care. They are frugal plants, getting by with minimum water and fertility. They do require full sun and well-drained soil, though. Think of those dry, rocky slopes to which pines cling in the wild.

Two seasons are usually required for a female pine cone to produce ripe seeds. The cone is a primitive type of flower constructed of a tight cluster of either male or female reproductive cells at the bases of scales which spiral around a short axis. In the spring gusts of wind shake loose pollen from the male cones, which are catkin-like clusters located mostly at the tips of the trees’ lower branches.  Yellow clouds of pollen waft upwards to the female cones, most of which are high in the trees. Fertilization, the actual union of the male and female reproductive cells, takes place during the spring following pollination, within the tightly closed, green female cone. Seeds ripen at the end of the second season.

How a pine disperses its ripe seeds can mean the difference between getting pine nuts into your pesto or losing them to foraging squirrels or in the needles beneath the trees. With some pines, ripe seeds drop from open cones that remain attached to the trees. Other pines will not open their cones to release their seeds except with the stimulus of heat or the blow of a hammer. Such a mechanism, making it possible to beat the squirrels to the bounty, exists for the Swiss stone pine and the Siberian pine. The Swiss Stone pine clings to its neat little seed packages until the third spring from flowering.

It’s almost impossible to suggest an expected yield of nuts from a single tree. The trees are rarely grown in plantations. Most nuts are harvested from more or less wild trees, rather than from trees growing under uniform orchard conditions. And even then, yields are variable and erratic.

Lack of precocity or erratic nut production shouldn’t be a deterrent to planting a nut-bearing pine. What these pines lack in instant gratification, they furnish in “piney” fragrance,  longevity, and for the beauty and character they bring to a landscape.

11 Comments

  1. Wendy Lindquist
    Posted April 8, 2020 at 3:48 pm | Permalink

    All your blog posts are worth reading but for some reason I found this one comforting in these times. Maybe it was just imagining the pine fragrance. Thanks!

  2. Theodore Daniecki
    Posted April 8, 2020 at 11:20 pm | Permalink

    I have 5 or 6 Korean pinenut trees. Last year 1 tree produced two pine cones with no visible seed. The tree is 8ft tall.

  3. Justin
    Posted April 9, 2020 at 8:28 am | Permalink

    Hi Lee,
    With the Korean pine, have you noticed any of the same pest vulnerabilities as with the native White pine? (specifically the white pine weevil or blister rust).
    Thanks,
    Justin

    • Posted April 13, 2020 at 9:14 am | Permalink

      No pests noticed, but then again I haven’t noticed any pests on the white pine around here.

  4. PATRICIA H LINTEREUR
    Posted April 9, 2020 at 12:52 pm | Permalink

    I have 2 korean nut pines in my yard and I love them even though I’ve never gotten a cone from them. When the wind comes up I like to stroll over and listen to them whisper. We’ve got plenty of other plantings to sustain us… blueberries, cherries, hazelburts, to name a few.
    I do have a question, I’ve read your Weedless Gardening book and I’m interested in using builders paper to create vegetable beds from the top down. I have a full roll of reddish builders paper, it even has landscaping listed as an application. Will the red dye harm my soil? Thanks, Pat

    • Posted April 13, 2020 at 9:14 am | Permalink

      I wouldn’t worry about the dye. The paper is only a one-time application. I use it all the time whenever starting a new planting.

  5. June Kozak Kane
    Posted April 14, 2020 at 1:12 am | Permalink

    Lee, can you please recommend a place for me to purchase organic pine seedlings? I usually find mine in various natural locations (like a foot high seedling growing on my son’s all-natural front lawn in Colorado) but I haven’t had the chance recently. I like to turn my seedlings into Bonsai. But after reading your article, I’d like to see if I could somehow manage to get a few trees to produce some edible seeds! By the way…I went to UW-Madison (BA Art History, ‘69) and had a psych class in the soils room with all the huge topographical soil maps on the walls! The class was Awful and it was only those maps that kept me awake. I once told my mom that when I retired, I’d go back to Madison and take a soils course. Of course, these days, I could probably take it online! Have you ever thought about going into the business of selling tiny pine seedlings? If so, please let me know! Thanks! June Kozak Kane (in Wisconsin for the next couole of years.)

    • Posted April 15, 2020 at 10:02 pm | Permalink

      It would be very hard to find organic pine seedlings or species that produce edible seeds. Take out the “organic” requirement and your chances go up.

      I graduated Madison the same year as you, in chemistry. I joined the soil science department in 1973. One of my favorite undergraduate courses was the survey course in art history.I also liked it because I was “friends” with an female art history graduate student at the time.

  6. milton spivack
    Posted April 15, 2020 at 11:51 am | Permalink

    Hi Lee,

    Any advice on growing garlic? Do i have to buy special garlic bulbs to plant, or can i plant the garlic bulbs from the grocery store? Also can garlic be grown from seed?

    • Posted April 15, 2020 at 9:58 pm | Permalink

      Surprise! I don’t grow garlic. I don’t use it much and it’s readily available at similar quality from a market. Just separate the bulbs and plant them in a sunny spot in good soil in late summer of early fall. No, it does not make seeds.

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