Growing Herbs in Windowboxescomments (14) August 6th, 2008
by Frédérique Lavoipierre
from issue #14
The sun set hours ago, and a steady, cold rain is falling. But there’s no need to put on rain gear and find the flashlight for a trip to the herb garden. I simply reach out the kitchen window for a last minute addition to our dinner salad—a rain-washed sprig of cucumber-flavored salad burnet. Ever since I planted my first culinary herbs and discovered I wanted them just outside the door, I dreamed of windowboxes spilling over with fragrant herbs. Now I have several boxes in different themes. Near at hand, the herbs get used a lot in my daily cooking.
Windowboxes are perfect for culinary herbs. Many of them grow well in confined spaces, and windowboxes provide the good drainage essential to most herbs. In addition, the Mediterranean ones will like staying drier under the eaves in areas of high summer rainfall. Eaves also give some protection from the cold, and being against the house wall further moderates temperature extremes.
Even the gardener with very little space can usually find room for a windowbox. If you have room for only a tiny box, simply select herbs from among the smallest varieties—miniature thyme, ‘Blue Boy’ rosemary, ‘Minette’ basil, dwarf moss-curled parsley—and avoid those that can easily take over a small space, such as mints, chamomile, and standard varieties of oregano, rosemary, and lavender.
With several boxes in different exposures, you can grow a variety of herbs. Hot, sunny sites are ideal for herbs from Mediterranean climates. A truly shady location will accommodate only a few varieties, but a windowbox in dappled light is ideal for shade-tolerant herbs. An eastern exposure is fine for most varieties.
Design your box to fit your style
It’s fun to come up with themes for my herb garden boxes. Some of my favorites are included here, but play around with combinations that suit your own cooking style. As I become interested in different cuisines and periodically renew the plantings, I redesign my boxes to suit my current culinary interests.
|Herb box à la Provençal includes sages (dwarf, purple, tricolor), sweet lavender (L. heterophylla), French lavender (L. dentata), thymes (French, lime, silver), sweet marjoram, winter savory, oregano, and rosemaries 'Golden Rain' and 'Blue Boy'.|
Nearby, I have some bronze fennel in a large pot, and a half-barrel holds a bay laurel. During the warmer months, I grow summer savory in a corner of the box, and tuck in a few annual flowers. In addition, I have added to my Provençal pot a number of the flavored thymes I enjoy cooking with—lemon, lime, oregano thyme, and ‘Orange Balsam’. This last, with its resinous orange-peel flavor, is particularly well suited to Provençal cooking.
Italian herbs are in a box on an east-facing window. Although oregano, sweet marjoram, rosemary, and sage are happiest in a southern exposure, they still grow well with only a half day of sun, and the basils, leaf celery, and parsley appreciate the afternoon shade. The various colored sages—golden, purple, and tricolor—are wonderful for creating some contrast. A fennel plant or a bay laurel in a large pot nearby is appropriate to this plant grouping.
|Sun-worshipping Italian herbs in a pleasing arrangement at the start of the season will fill their box to overflowing by the time summer's heat arrives.|
|The shady windowbox includes four kinds of mint (pineapple, spearmint, peppermint, Corsican mint groundcover), chervil, alpine strawberries, sorrel, salad burnet, and violas and violets for garnish.|
Fines herbes—chives, tarragon, chervil, parsley—is a classic of French cuisine. I grow all four in one large basket on an east wall, but they could as well be in a windowbox. The chervil will grow only in cool weather, so I sow seeds every few weeks for a longer season. During warmer weather, I use a little more tarragon in my cooking and leave out chervil. In summer, a couple of nasturtiums trailing down the edge give a lovely effect. Fines herbes are delicious in omelets, sprinkled on a creamy cheese, or in a spring salad of butter lettuce.
I like to plant a basket of the various basils near my kitchen. There’s not enough for large batches of pesto, but I use it often to add a bit of flavor to a dish. There are many basils that will work. My last basket contained Thai, ‘Mammoth’, ‘Genova’, ‘Red Rubin’, and ‘Cinnamon’. Others to try include lemon basil, dwarf bush basil, and ‘Purple Ruffles’. ‘Cinnamon’ basil blossoms are delightful in fruit salads; lemon basil has an affinity for fish, and Thai basil is a natural in Asian cuisines.
Right plant, right box
Dwarf varieties of many herbs are available and will fit right into a windowbox environment. Among them are miniature thymes, compact oregano, dwarf sage, and small forms of parsley, basil, chives, and dill. Dwarf ‘Blue Boy’ rosemary has a better flavor and is more compact than prostrate rosemary. Dwarf sage has narrow, silver-colored leaves and impressive spikes of purple flowers in spring and summer. Dwarf forms of oregano don’t share the same strong flavor of their Greek and Italian brothers, but they still taste of oregano and are much smaller.
Naturally compact herbs also work well in all but the smallest windowboxes. Tarragon, chervil, sweet marjoram, creeping winter savory, many of the oreganos, sweet woodruff, and chives are but a few possibilities. Most of the thymes work well in confined situations. I like to use silver and lemon variegated thymes for the contrast they provide. Among the rosemaries and lavenders, look for varieties that stay under 2 ft. tall.
|Gaps are good for allowing air circulation behind your windowboxes.|
Potting mix should be lightweight, drain well, and yet hold moisture. I use a commercial mix to which I add compost and fertilizer. If you’re concerned about weight, mix in some perlite. Fill the box to the top, and water it well to settle the soil before planting. The final soil level should be 1 in. to 2 in. below the rim of the planter.
Arrange plants in an attractive group before planting as it’s easier to work out a pleasing combination while they’re still in their pots. I try to place thirstier plants toward the back and middle of the boxes, where the soil stays moist the longest. Most contrast is provided by foliage, so keep in mind color, texture, and form when working. I harvest regularly, so I plant herbs close together for a full look.
I enjoy some color in my boxes, so I fill in with annual flowers such as gem marigolds, violas, and nasturtiums. These are all edible flowers, although low-growing, non-edible annuals such as alyssum, creeping daisies, or lobelia will also work well. Small bulbs such as species daffodils, crocus, and grape hyacinth are another way to add seasonal color. I sometimes use small-scale perennials (violets and alpine strawberries are especially suitable) in my herb windowbox gardens.
|Fines herbes go from windowbox to omelet in a flash.|
Periodically renew the windowboxes. Early spring or fall is a good time to do this. Discard any spent plants, and top prune and root prune (especially spreading herbs like mint) to keep the perennials compact. Replace as much spent soil as practical with fresh soil and fertilizer. Replant, add any new plants, and you have a rejuvenated beauty of a box just outside your kitchen window. If you live where the ground freezes, dig up any sensitive plants and winter them in a sunny, enclosed space where the temperature remains above 40°F.
As for using your herbs, here are some of my favorite recipes:
• Fines Herbes Omelet
• Chicken Roasted with Herbs and Root Vegetables
• Peas with Mint
posted in: herbs, containers