PLANTING AND TRANSPLANTING - right now is one of the most convenient times for planting new fruit trees, roses, berries, and other deciduous plants. Nurseries and garden centers have their finest and most complete selection of new plants at this time, so you get the pick-of-the-crop. As for transplanting, it should be done as soon as possible, because many plants are already beginning to start their spring growth.   WEEDING - probably one of the most over-looked and dreaded tasks is weeding. But, it is one that really needs to be accomplished before the weeds have a chance to flower and go to seed and really become a nuisance. Remember once the weeds go to seed you can be fighting that weed seed for up to seven years or more. And, it is not unusual for some types of weeds to produce up to ten thousand or more seeds per plant. Most weeds can simply be pulled or cultivated out of the garden. Others, some of the more persistent like horsetails, morning glories or quackgrass you may need to use a herbicide to effectively eliminate them.   WATERING - Check the plants under the eaves of the house and under tall evergreens to see that they have sufficient moisture. Even with as much rain as we have had over the past several weeks, plants situated in these areas can be bone-dry and in desperate need of water. PERENNIAL PLANTS - March is the month when many of the beautiful spring flowering perennials begin to flower. Aubrietia, Candytuft, Rock Cress, Bergenia and many others are not only nice rockery plants but are nice plants to use in perennial borders, landscape plantings or as perennial ground covers.                                                                                               Next