Category Archives: asparagus

Watering in the Heat, and more… by Peter Heffelfinger

By Peter Heffelfinger

posted August 16, 2022

Watering in the Heat

The first half of August usually brings the hottest weather of summer, but the impact of climate change has brought more intense heat waves, with the daytime temperatures on Fidalgo Island consistently in the 80’s. We are fortunate, being close to the cooling effect of Puget Sound, which creates late afternoon onshore breezes that can take the edge off the heat. The nighttime temperatures, however, have been staying in the 50’s, even during the heat domes. The cool nights, a harbinger of the fall weather that will start to creep in later in the month, have also created the grey mold on the leaves of the big leaf maples as well as on the foliage of some winter squash.The vegetable gardens, however, still require a great deal of water to deal with the overall summer drought.

Watering the hoophouse paths

The basic garden watering mantras hold: water early in the day, to avoid loss of water to evaporation, and to give the plants time to absorb prior water prior to the daytime rise in temperature; use a protective mulch of some kind to protect the surface of the soil from drying out and to keep the soil moist around the root zone of the plants; and, water deeply on a regular basis, when the soil begins to feel dry to the touch at a depth of 2-3 inches, usually every 2-3 days. Watering too lightly and too often keeps the roots close to the surface of the soil, and the plants are easily dried out on hot days. For some crops that are producing heavily right now, such as pole and bush beans, I water more frequently in order to ensure a sustained crop of tender and sweet beans. Unless you’re raising dry beans or saving seed, remove any pods that get too large and tough in order to keep the plant producing more flowers.

Asparagus and Artichoke plants needing water in August

Fall and Winter Plantings

Mulching the leek beds

It can be difficult to think about fall and winter crops while it’s still high summer, but now is the final window to put in over-wintering leeks, cabbages, late cauliflower, purple sprouting broccoli, and hardy leafy greens. I water the young transplants each morning to give their still-fragile root systems moisture to deal with the intense sun and extended day length of our northern latitude. The reward in late fall and through the winter is a sustained crop of fresh produce that can be harvested from the garden even on the coldest and wettest days.

winter brassica transplants, with grid to support temporary shade cover

Other semi-hardy winter vegetables to consider, which may need some protection from a row cover tunnel, include daikon and black Spanish radishes, non-bulbing leaf turnips, hardy mustard, broccoli Raab, and cold-resistant greens such as mache, arugula, and winter spinach. There is no need to shut down the garden in late fall. The key is to plant early enough in late summer to allow the plants to reach an adequate level of maturity before the cold and short days arrive. The plants then essentially coast through the winter, sprouting fresh shoots, leaves, and buds in response to the warmer days in between the storms. Winter is the fourth season of year-round gardening.

Other Watering

During August one should not forget to water existing perennial beds, such as asparagus and artichokes, which have already produced a main crop, but still need doses of water to keep their root structures growing until the cool fall rains arrive. For standard crops such as corn and squash, regular deep watering is needed to keep them on schedule. I do have some late planted large sweet onions that are still green since they are in half shade, which are still getting a bit more water. The main crop of storage onions, however, has reached maturity, and the half-brown tops have been bent flat to the ground to stop further growth and dry them out in the sun. It’s important as well to know when to turn the spigot off.

Onions drying in the sun

The Hoop House

The hoop house requires a more intense and sustained regimen to keep the tomatoes, peppers, cukes and tomatillos properly hydrated. To prepare for the hottest days I covered half the roof with two 40-foot bands of light green shade cloth, made from recycled soda bottles, as a way of cutting down on the sunlight. Not a drastic reduction, perhaps 10%, but a noticeable effect on the high temps up at the ridge pole, which can easily soar to 95F and above if left unchecked. The temperature down at ground level is usually 5-8 degrees cooler. Tomato plants will drop their flowers in response to the stress of extreme heat of temps above 90F. Being perennial vines, tomatoes will generate new blossoms fairly quickly but the final crop will naturally be reduced. Pepper plants, as bushes, may drop a few flowers even in normal growing conditions, and are slower to re-flower if impacted by high heat.

Given the still-cool nights, I lower the side walls and end flaps of the hoop house in the evening to keep the temperatures inside above 50 degrees to maintain fruit-setting. I open the house early in the day since the first rays of the sun can easily jack the thermometer to 80-90F. The key to cooling the semi-enclosed space is to keep the air flowing. When the weather is consistently hot I water the beds heavily every 2 days, making sure the mulch and the soil around each plant is properly saturated. On the extreme heat days, especially when there is no wind, I take the added precaution of flooding the paths, creating shallow pools between the raised beds to increase evaporation and to make sure the deep roots get water. Two 50-gallon drums on raised platforms with gravity-fed hoses supply the irrigation system for the hoop house. So far, I’ve managed to prevent any blossom drop due to water stress, relying on a well that feeds off the water table coming from the back side of Whistle Lake. This year there has been plenty of water, but in past Augusts the flow of the well has diminished. Hopefully the increased precipitation during recent winters due to climate change will be enough to continue to supply our gardens during the now extended Mediterranean dry summers.

This Week in Gardening (TWIG) — First One of 2021!

By Peter Heffelfinger

Posted March 15, 2021

After a winter of being cooped up during the pandemic, I’m sure gardeners are anxious to get started growing things once again. Before jumping into spring planting, I thought I’d start this year’s edition of weekly updates with a look back over what survived this past winter. Spring will arrive soon enough, if not already here.

The heavy foot of snow that fell on South Fidalgo in February served as a layer of insulation, protected the ground from freezing very deeply and kept the hardy over-wintering plants from exposure to wind. With the rapid melt of the snowfall, and the change to warm and dry weather in early March, we’re experiencing a much earlier spring, as has been happening more and more the past few years.

Perennial Vegetables

Basic to any system of year-round gardening are vegetables that reappear on their own each spring. Although they may initially take up to several years to reach full production, they’re certainly worth the time and effort. The main concern is finding a permanent place in the garden, safely removed from any ongoing system of crop rotation. Once established, perennials take a minimum of care, mostly a little regular weeding, some watering in summer, and regular pruning or cleanup as needed. A layer of well-cured manure or other form of fertilizer applied in the fall serves a source of slow-release nutrition. The appearance each year of a reliable crop is a welcome relief from the usual spring rush to get seeds or transplants in the ground.


Rhubarb

Rhubarb will supply a few leaves the first year, depending on the size of the start, particularly if you are able to find a mature root ball divided from a well-established bed. I found a large rhubarb root at the very first Transition Seed Swap years ago. It is still producing and has filled out a small bed of its own in a corner of the garden, right next to a permanent stand of thornless blackberries. Note: rhubarb leaves get gradually smaller and thinner after 4-5 years and the root needs to be sub-divided to maintain vigorous growth. Rhubarb is one of the earliest crops to be harvested, with the appearance of the bright red stalks serving as a spring tonic visually, as well as for their tart taste, which mixes well with the standard local perennial, strawberries. I am always amazed at the elephantine leaves bursting out of the ground. If large skunk cabbage leaves are a first sign of spring in the woodlands, then rhubarb is the starting flag for the garden.

Artichokes

Artichoke plants will offer an edible head or two the first year, but will start to take off the following season, once the roots are well-established. The key is to harvest the buds when they are tender, before the outer leaves get stiff, since these plants are an edible form of thistles. If you do allow a bud to open up, the flower is a deep blue, and a boon to bees. The fully mature blossom, cut with a long stem and hung upside down to dry, also becomes a distinctive dried flower. I always think of artichokes as welcome visitors to our cool coastal clime from the sunny and warm Mediterranean.

During that week of 20F-degree weather in February of this year, I took the added precaution of putting a temporary covering of floating row cover over the still-standing stalks of artichokes, mostly as a barrier against the wind. They seem to have survived so far, particularly the purple variety Violetta de Provence, which is more susceptible to cold than the standard Green Globe, the variety commonly available locally. The Violetta has smaller, more conical heads, but a much finer taste and more tender leaves.

Asparagus

Of all the typical perennial vegetables, asparagus takes the longest to develop a good harvest, usually reaching that stage in the third year as the roots mature. But, to compensate for the long wait, the taste of the fresh-cut spears is extraordinarily sweet in comparison to the commercial bunches that have been shipped in from elsewhere. Resist the temptation to cut more than a few stalks the first two years and make sure the plot has a good supply of manure and compost, especially over the winter. I grow mostly a standard green variety; the purple type has not done as well so far.

Like artichokes, fresh asparagus is one of those vegetables that is a particular luxury. Maybe it is because they both are enjoyed with lots of melted butter. My asparagus bed is entering its fourth year and I am anticipating a steady supply. Finally, do let a good number of late-appearing stalks leaf to bushy maturity during the summer. The vegetation is needed to continue the cycle, allowing the roots to develop next year’s crop.

Cooking Note: if a few stalks do get too large and the bottom parts get a bit woody, use a vegetable peeler to remove the thick lower skin. The white inner pith will still be soft and edible, but just not that distinctive bright green of the more delicate upper spears.

A roundup of Over-wintering Hardy Vegetables

The January King cabbages offered small but tasty heads all winter, and are now sending up fresh side-sprouts from the cut stalks left in the ground. Two large collard plants did well all winter, sporting large healthy leaves seemingly impervious to frost. A sure sign of spring, the lacinato kale plants, like most hardy brassicas, are putting out multiple florets, an early version of broccoli. Keep the top-most buds trimmed off; they’ll be a steady supply of greens for fresh stir-fries. Other plants that did well included Mizuna and Purple mustard, Tat Tsoi bok choy, broccoli Raab, as well as Miner’s lettuce and a bushy form of arugula. Hiding under the leaves for a spring treat were Purple Top turnips, the roots unaffected by frost.

The brussels sprouts, however, suffered from the lack of winter cold, developing brown mold on the lower buds early on, and colonies of aphids on the topmost growing tips during any warm spell. What used to be a reliable crop now seems to be an extended challenge. I can understand a quote from a local farmer saying they are difficult to grow. Makes one appreciate the vast acres of purple and green brussels sprouts that are harvested in the valley just before Thanksgiving. Commercial sprouts would likely be non-organically grown, and unsweetened as yet by any touch of serious frost. I may stick to hardy cabbages as a more reliable winter brassica.

Leeks are the standard fresh allium in the winter garden. The main plot of leeks was harvested regularly, while two small beds of late-summer planted leeks are just now coming to maturity in March. The last of the leeks will develop a hard pith in the center as the temperature warms up, but the outer sheaths are still edible. As the green sprouts of the regular chives and garlic chives emerge in their pots in the kitchen garden, the fresh onion cycle begins again.

Peter Heffelfinger

A New Backyard Pest; and much more

By Peter Heffelfinger

Posted June 8, 2020

A new backyard pest

I spent several days this week dealing with an infestation of what looked like tiny, black, leaf-eating caterpillars that swarmed over a mature stand of highbush cranberry shrubs and also onto one nearby snowball bush. The leaves were skeletonized, leaving the stems and veins intact, by what resembled tiny leeches with legs, crawling up the main trunks to get to the foliage. The only solution was to cut down the tall shrubs completely and take them to the burn pile for immediate incineration. I am hoping I got rid of enough of the pests before they invade a nearby prized Japanese maple or a Korean dogwood that is in full bloom.

The soft cranberry shrub leaves were more susceptible than the thicker leaves on an adjacent shiny laurel, which was also covered by what looked like sticky frass, the technical term for insect droppings. So the laurel went as well, just to be safe. The recent heavy rains and lush undergrowth may have been part of the cause, but it is the first time I have seen such an invasion on mature shrubs that I have been growing and pruning for several decades. It certainly felt like an outbreak that had to be dealt with firmly. I will be on the lookout for further signs and will try to identify the critters specifically.

 

Tomato pollination

As the tomatoes climb up their supports and start to flower, it is important to remember that in order to set fruit the plants need to be kept above 50F degrees at night. When closing up the hoop house in the evening to maintain the heat, I give the tomato cages a quick shake to get the pollen out into into the air. Hopefully the small green buttons of nascent tomatoes will soon start to appear. The cherry tomatoes always come first, given their small size, leading the way for the larger standard varieties.

 

Vegetable perennials: artichokes and asparagus

I grow a bed of the standard Green Globe artichokes, which are just coming on. They are a welcome treat, but somewhat bland-tasting, and must be picked before they get too tough. I do have one bush of purple artichokes, Violetta de Provence, an Italian variety that produces smaller chokes, but with a much more delicate flavor. When picked early, you can eat almost the entire bud. Gourmet thistles.

The other garden perennial is the bed of asparagus, which is just reaching maturity in its third season. It has been worth the wait. Now one can pick a high percentage of the stalks, which are decidedly sweet when eaten straight from the garden. A key to a sustained harvest is to keep the bed well watered as the roots send up the shoots.

 

Broccoli

The first rush of ripe broccoli is also here, having recently emerged from their floating row cover. I blanch the flowerets for a few minutes just until they turn bright green, then quickly chill in cold water. I like them as an appetizer dipped into a sauce of mayonnaise mixed with a bit of dry mustard and a spritz of lemon juice. I have also found that the plain stems can be eaten as well if you cut them into small slices or julienned strips and blanch them a bit longer than the tops before chilling. If the stem is particularly tough, use a vegetable peeler to get rid of the thick skin. Eat the whole vegetable.