The pecan is probably more exacting in regard to its climactic requirements than are our other kinds of nuts, but the filbert or hazlenut is probably a close second in this respect. The filbert, however, represents the opposite extreme in that it does best under conditions of mild winter and moderate summer temperatures. These differences are pointed out for the reason that many amateur nut growers want to grow certain nuts outside of their native range in places where unsuitable climatic conditions prevail, and they cannot understand why success is not possible. +Growth and Fruiting Habit of Nut Trees+ Since the growth and fruiting habits of our different kinds of nut trees are closely related, it is desirable to point out some of these relationships. All of our different species of walnuts, the pecan and all hickory nuts, as well as hazelnuts and filberts, are borne terminally on shoots of the current season. In other words all walnut species, pecan, and all hickory species bear the pistillate flowers that develop into nuts at the terminal end of the shoots produced the same year that the nuts mature. The staminate or pollen-producing flowers of all these species arise from lateral buds on shoots that grew the previous year. In the case of hazelnut and filbert the pistillate flowers are borne in lateral buds on shoots of the previous season, as are also the staminate flowers or catkins. In this case, however, the pistillate flowers are formed and pollinated before the current year's shoot growth is made. Almonds are borne laterally on shoots produced the previous season. All chestnuts are borne laterally on shoots produced the same season as the nuts. The chestnut bears most of the staminate flowers separately in staminate catkins whereas the pistillate flowers are in mixed catkins, but all are formed laterally on shoots of the current season. The almond, which has perfect flowers, produces these in lateral buds on shoots of the previous year. Both the hazelnut and the almond flower before any current-season growth is made, whereas all of the other kinds of nut trees mentioned produce almost all normal shoot growth before flowering occurs. These differences in growth, flowering, and fruiting habits provide a basis for the explanation of why growth of almond trees, for example, is harder to maintain than is that of walnut or pecan. Flowering and early development of the fruit before shoot growth is made tend to check such growth, so that flowering and fruiting trees will not make as much new growth as they would have made had flowering and fruiting been prevented.