Pear grit and the art of aging

Nostalgia emanates from a basket of pears, inspiring Katherine to explain what makes up these glorious, gritty, and gorgeous late-summer fruits.

Last week a dear friend conjured an entire autumn for me when she handed me one of her pears.  She had picked it a few days prior from one of the small espaliered trees that guard the outside of her bedroom wall and overlook her garden.  It was pale buttery gold with a pink blush, soft and honey-flavored.  A month past the solstice, we were still able to enjoy the low sun well into early evening as we sat on her deck and gazed over the garden, savoring the fruit.Rosaceae talking pear

Bartlett pears, like my friend’s, ripen in the summer and yet they herald the fall.  They appear, and we start the inevitable tumble towards apples, wool socks, and the bittersweet baseball postseason.  Other popular varieties, such as Bosc and d’Anjou, tend to arrive later, when we have already come to terms with shorter cooler days.

I love apples, but they are not as emotion-laden for me.  Whereas apples seem timeless, even summer pears carry an old fashioned patina.  They evoke a time when canning was a skill necessitated by the Depression, but which still made a lot of good sense.  My grandmother must have spent a thousand hours canning the soft sweet pears from her trees.

Pears also know how to age right.  Apples are harvested ripe from the tree, but pears should be taken when they have reached their full size and before they are ripe.  My friend always picks her pears before the squirrels can mark them with bite-sized divots, a practice that also happens to keep them from becoming mealy on the tree.  She sent me home that day with a bag of firm green Bartletts and instructions to hold them in a bag in my kitchen for a couple of days.  Summer varieties don’t require chilling, but d’Anjou and Comice pears benefit from a month of nearly freezing temperatures, followed by ripening at room temperature (Stebbins et al).  The proper aging of pears is all about managing the activity of enzymes that alter various compounds and break down cell walls.  Such treatment would ruin high-maintenance peaches, which are horrified by the thought of getting old and don’t take well to chilling. Continue reading

Super styled

Corn silks are annoying, but they’re also amazing. The longest styles on the planet don’t make it easy for corn pollen to do its job.  Gain new respect for your corn on the cob. 

Corn plant. Tassels with male flowers on top, ears with exposed silks in the middle

Corn plant. Tassels with male flowers on top, ears with exposed silks in the middle

Fresh corn (Zea mays, Poeaceae) is a summertime treat. Shucking corn silks, though, can be a pain.  Corn silks, however, are amazing, and maybe knowing why will ameliorate their annoyingness.  Formally corn silks are the style, the part of the female flower that intercepts pollen.  Female flowers of many species have a stigma, a sticky pad, atop their styles to intercept pollen, but corn silks are lined with sticky trichomes (like hairs) that essentially do the same thing.  Corn silks are incredibly long styles.  Can you think of another plant with a flower appendage that could rival it?  I can’t.  Continue reading

Tarragon’s family tree

Tarragon is one of many Artemisia species with a storied past.  Jeanne introduces you to her favorite genus. 

If you love eating French food, and especially if you love cooking it, when you see a tarragon bush, inevitably you think of the French quartet fines herbes:  fresh parsley, chives, tarragon and chervil.  You may reminisce about a perfect (or broken) Béarnaise sauce.  These days when I pass my tarragon plant I vow to actually use it, as we’ve neglected it this year.  I also think of sagebrush.  And absinthe, martinis, and Shakespeare. And weeds, malaria, and hippies.  I attribute this motley mental association to tarragon’s membership in my favorite genus, Artemisia, a large group in the composite (sunflower) family, Asteraceae, with a rich history. Continue reading

Caterpillars on my crucifers: friends or foes?

A high glucosinolate (putatively anti-cancer) broccoli variety is now on the market.  Jeanne wonders if caterpillar herbivory-induced increases in glucosinolates can match it.  The answer is unsatisfyingly complicated. 

Cabbage butterfly pupa on the tile above my sink. A survivor from washing crucifers from the garden.

Cabbage butterfly pupa on the tile above my sink. A survivor from washing crucifers from the garden.

There are three primary reasons why I haven’t launched aggressive war on the cabbage butterfly (Pieris rapae) caterpillars munching on the cruciferous veggies in my garden, even though I don’t like them:  (1) garden neglect; (2) hostility towards most pesticides; and (3) bonhomie toward caterpillars by my toddler.  There is also a fourth reason.  I know that in general most plants increase production of chemical defense compounds when they detect that they’re being attacked by pathogens or herbivores (Textor and Gershenzon 2009).  Some of these defense compounds have been shown to be beneficial for human health, including those in crucifers.  I’ve been wondering for a while if those caterpillars were actually enhancing the value of the tissue they didn’t consume.  A recent report about a high-defense-compound laden variety of broccoli prompted me to do some research into the issue.  I’m left with more questions than answers. Continue reading

Aching for strawberries

If you have ever doubted the practical side of  plant anatomy, keep reading, as Katherine explains what you can learn about flowers by cutting up a strawberry.  As it turns out, this enigmatic little gem is packed with coincidences and apocrypha along with its citric acid and anthocyanins.  Could it turn out to be true that a strawberry is a berry after all?

Welcome to early June, when strawberry season is finally well underway across the US, as far north as the upper Midwest and New England.  Here in the promised land where little green plastic baskets are never empty (coastal northern California), there is still a peak season for strawberries, since the popular varieties don’t reach their full potential until mid-May.

With so many strawberries in so many kitchens this month, now is the perfect time to merge botany lab and breakfast preparation by working through the many parts of a strawberry.  Once you have mastered berry dissection, I promise you will find it a surprisingly versatile skill.  Having the confidence to steer a conversation towards strawberry anatomy can help you recover from one of the more awkward inevitabilities of summer – biting gracelessly through an enormous chocolate-covered strawberry just as you are introduced to the mother of the bride.  After you have pointed out the veins and ovaries and have explained the developmental origin of the epicalyx, she won’t remember the red juice and bits of chocolate shell you have just dribbled down your frontside.  Or so has been my experience. Continue reading

Bamboo shoots: the facts about bracts, part 3

Bamboo shoots invade the lawn.  The biggest two are ready for harvest (photo by David Inouye)

Bamboo shoots invade the lawn. The biggest two are ready for harvest (photo by David Inouye)

Jeanne continues Bract Month here at the Botanist in the Kitchen by describing the morphology of an interesting and delicious springtime specialty:  fresh bamboo shoots.

I had the distinct pleasure a few weeks ago of trying a temperate springtime speciality:  fresh bamboo shoots.  The friend who shared them with me has a backyard bamboo thicket and harvests the young shoots when they pop up as incursions into the lawn.  Globally, he is in good company, as the fresh shoots show up in springtime (or otherwise seasonally appropriate) markets in most of Asia, which is the native range of most of the 1400+ bamboo species.  Probably like many modern Americans, before steaming the fresh shoots and putting them in a lovely spring chopped salad last week (we used a lemon-garlic-dill vinaigrette), I had only eaten bamboo shoots as neat, thin, rectangular or julienne slices of canned bamboo shoots in various Thai curries at and Chinese soups in restaurants.

Peeled bamboo shoot, showing tender immature leaves and apical meristem tissue

Peeled bamboo shoot, showing tender immature leaves and apical meristem tissue (photo by David Inouye)

The fresh shoots are a big improvement over the canned and have the texture of asparagus and a flavor like a mild, tangy corn.  These similarities might arise from shared evolutionary history between bamboo and both vegetables.  Like corn, bamboo is a grass (family Poaceae; see our post on the evolution of gluten within the grasses for a phylogenetic context of bamboo within the grasses).  Like asparagus, bamboo is a perennial monocot (see our monocot diversity essay and our food plant tree of life for a refresher on monocots and their phylogenetic position within all plants), and its shoot is a new young stem developing from underground stems called rhizomes that spread out from a parent plant as a form of asexual reproduction. Continue reading

Preparing asparagus: the facts about bracts, part 2

If artichokes are big balls of spiny bracts, then asparagus spears are telescoped rods with membranous scales.  In this follow up post, Katherine takes on asparagus, both the tender and the tough, and explains why peeling can’t rescue a woody spear.

Asparagus is a hopeful spring vegetable.  Asparagus aspires, breathes in the warming spring air, and optimistically pokes its nose up from the ground.  Its tips are clusters of tiny developing branches, still packed tightly like an unexpanded telescope, containing all the potential of a season’s worth of growth.  Except that we whack them and eat them  before they can realize their audacious plant dreams.  There’s no need to feel entirely bad about this, though.  The spears stay alive for a while, stubbornly growing tougher until they are cooked or digested. Continue reading

How to make an artichoke: the facts about bracts, part 1

Inspired by spring and the appearance of both artichokes and asparagus, Katherine explains artichoke morphology in the first of two posts about bracts and scales.

Artichokes don’t exactly look like food, and their name in English is homely and offputting.  The scientific name is no better.  Cynara cardunculus variety scolymus rolls off the tongue like a giant ball of tough spiny bracts.  I’m not ready to call it an onomatopoeia, even though artichokes are giant balls of tough spiny bracts.  And the word “bract,” on its own, is just flat-out ugly.  But artichoke bracts have delicious meaty bases, and they protect the tender inner part of the bud which we call the heart, so I am a C. cardunculus var. scolymus bract fan. Continue reading

Greens: why we eat the leaves that we do

Jeanne reveals which branches of the evolutionary tree of plants bear edible leaves and speculates about why that is.

Giant coconut palm (Cocos nucifera) fronds dwarf me

Giant coconut palm (Cocos nucifera) fronds dwarf me

Most of the 300,000 + plant species have leaves, and the function of all of them is to perform photosynthesis.  They are the ultimate source for all of the oxygen and food for the rest of the food chain and help regulate the global carbon and water cycles.  They are also nutrition superstars.  To figure out why greens are good for you and whether all leaves are equal in this regard, we need to take quick look at global leaf structural variability and broad evolutionary patterns in the species that make their way onto our tables. Continue reading

Cucurbita squash diversity

Jeanne introduces the diversity of some American natives, the squashes in the genus Cucurbita.

Spring is officially here, and I have squash on my mind.  We’ve ordered zucchini seeds for the upcoming summer garden but still have acorn squash from the fall sitting in the pantry (both are varieties of Cucurbita pepo). Our winter vegetable CSA box recently bequeathed to us the tastiest winter squash I’ve ever eaten, a Seminole pumpkin, which is a different variety of the same species (Cucurbita moschata) as the butternut squash sitting on the counter, destined for dinner.  Now between last year’s hard winter squashes and the tender summer squashes to come seems a good time to remind ourselves of the origins and diversity of squashes in the genus Cucurbita. Continue reading