THE PECAN
The pecan is a member of the hickory group and its range in this continent extends from Iowa to Mexico. Other hickories extend into Canada. The hickories are valuable for both nuts and timber. Fifteen different species of the hickory group have been recorded. Of these only three or four produce nuts of outstanding value. In nut production, the pecan hickory is the most important of all the hickories. For crop value of nuts it rivals the Persian (English) walnut and the tree is one of the largest east of the Rocky Mountains. The pecan tree is native to the south and south central parts of the United States and it is found in the forests as a native tree throughout Missouri.
Commercial production within the state may reach 800,000 pounds or more in good crop years, and according to the State-Federal Crop Reporting Service there are now about 88,000 pecan trees in the State of bearing age. All of these consist of seedling groves except the comparatively recent orchard plantings of the southeastern area. Commercial culture of standard varieties in the United States is confined largely to Georgia, Texas, Oklahoma, Louisiana, Alabama, Mississippi and Florida.
The natural habitat is along streams and on river bottom lands. At the present time the commercial varieties consist mainly of the large so-called "paper-shell" sorts of southern origin. These require a comparatively long growing season for their development. Consequently the southern types may not be productive in the more northern regions.
The cultural range of the pecan may be divided into two rather large belts, known as southern and northern. In fact, pecan culture is sometimes designated as "southern" and "northern" due to differences in size of nut, thickness of shell, and time required for maturity of nuts. The approximate northern limit of the southern area is near the extreme southeastern boundary line between Missouri and Arkansas. The northern belt extends into Nebraska and Iowa and includes approximately the entire state of Missouri.
The chief difference between these areas is the length of the growing season. In general, the southern or "paper-shell" varieties require from 240 to 250 days to mature their nuts, while the northern varieties which produce usually nuts of smaller size with somewhat thicker shells need from 180 to 200 days.