With the hottest days of August behind us, this is a great time to plan for cooler times ahead. Particularly at the juncture of two seasons, your greenhouse provides a growing environment sheltered from increasingly unpredicatable weather. Chilly nights? Just close the vents and let the thermostat bring on a little heat. Indian Summer? Re-open the vents and doors.

While outdoor crops are likely to be affected by these seasonal fluctuations梬eathering increasingly cool fall temperatures, and eventually, frost梬ith a little well-timed intervention, your greenhouse plants can continue to flourish. Of course, even inside the greenhouse, summer temperatures won抰 necessarily remain for long. And don抰 forget to take into account the shortening day length at this time of year. Some crops are better candidates to grow under these conditions than others.

The vegetables best suited to fall and winter greenhouses are those which thrive in relatively cool temperatures-- so that you don抰 have to crank the heat way up to keep them happy-- and that also don抰 require maximum light levels. In other words, it抯 the perfect time of year for growing greens and herbs.

Grow your own mesclun salad mix, by planting any of the widely available seed packets. Try a mixed greens mix, like 揜enee抯 Stir-Fry Mix.?Start some kale or chard now, and you can be harvesting through Christmas.

While it抯 best to buy plants of the perennial herbs, such as chives, rosemary, tarragon and thyme, make several plantings of annual herbs--spread out over a period of months-- it抯 a great way to harvest chervil, cilantro and dill over a longer time period.

If you already have large specimens of perennial herbs in containers, just bring them indoors. This is a good time to give them a good trim; they will take up less room inside, and be easier to care for too. Just make sure to check them well for insect populations; after making a thorough visual inspection, wash with insecticidal soap as a precaution. If you do find evidence of an infestation, spray at least twice. Once plants are in a small, closed system, it becomes much more challenging to eradicate problems.

By planning ahead, you can harvest salads and green vegetables throughout the winter. Remember to thin seedlings and leave room around potted specimens. Crowding can reduce light and encourage disease and insect pests; avoid overwatering too. Harvest often, and enjoy!