Evidence #379 | November 16, 2022

Book of Mormon Evidence: Botany and Jacob 5 (Pruning)

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Scripture Central

Abstract

The allegory of the olive tree, recorded in Jacob 5, contains many details that are consistent with known botanical principles and horticultural practices.

Zenos’s allegory of the olive tree recorded in Jacob 5 contains, by far, the most extensive discussion of olive horticulture found anywhere in scripture. While some of its olive-related details can also be found in biblical texts, many others couldn’t have been derived from any biblical source or combination of sources.1 This provides a unique opportunity to test the Book of Mormon’s content, in this case on botanical grounds.

In 1990, Wilford M. Hess, a professor of botany, compared Zenos’s allegory with known facts and principles pertaining to the cultivation of olive trees.2 Several years later, Hess, along with additional researchers, significantly expanded upon his original work.3 They concluded that “Nearly all of the allegory in Jacob 5 corresponds exceptionally well with both ancient and modern botanical principles and horticultural practices.”4 The following sections present just a sampling of such correspondences, most of which relate to the practice of pruning trees.

Pruning, Plucking and Trimming

The need for “pruning,” “plucking,” or “trimming” is mentioned throughout the allegory as a primary method of caring for olive trees.5 This accords well with ancient and modern olive cultivation. “In order to obtain fruit production each year, an olive grower must prune annually. There are a number of pruning procedures, which include lowering, reduction, crowning, pollarding, cutting back, and undercutting. Growers must carefully calculate the amount of wood to remove, requiring the pruner to be expert at his work.”6 As described in Jacob 5:65: “ye shall clear away the branches which bring forth bitter fruit, according to the strength of the good and the size thereof.”

Pruning olive branches. Image via https://dengarden.com/.

Main Top Removed

Because of the care given to the tame tree by the Lord of the vineyard, “after many days” it began to bring forth “somewhat a little, young and tender branches.” Yet despite his efforts, the “the main top thereof began to perish” (Jacob 5:6). This would cause a serious problem. “The main branches, with the greatest access to the light and sap, are the most important to the tree and should have the best chance for becoming productive, but when they become old and unproductive they need to be removed.”7 Hence the master of the vineyard began to “pluck off those main branches which [were] beginning to wither away” (v. 7).

A large olive tree. Image via ecoevocommunity.nature.com.

Balancing Roots and Branches

The Lord of the vineyard stated that the wild branches grafted into the tame tree had “overrun the roots thereof; and because that the wild branches have overcome the roots thereof it hath brought forth much evil fruit” (Jacob 5:37). After further investigation of this problem throughout the vineyard, the servant declared, “Is it not the loftiness of thy vineyard—have not the branches thereof overcome the roots which are good? And because the branches have overcome the roots thereof, behold they grew faster than the strength of the roots, taking strength unto themselves” (v. 48). As explained by Hess, et al.,

There is a distinction between mineral uptake by roots, particularly the influence of nitrogen compounds, which are necessary for wood growth, and carbon assimilation by photosynthesis, which takes place in the leaves and supplies carbon for the forming of the plant body, including the fruit. In order to get a full crop of olives an equilibrium must be maintained between these two processes. … The equilibrium is broken when mineral substances from the roots become less available. When this happens rejuvenation pruning is necessary to reduce the aerial portions of the tree.8

This need for equilibrium between roots and branches is most clearly articulated in Jacob 5:66: “wherefore ye shall clear away the bad according as the good shall grow, that the root and the top may be equal in strength” (emphasis added).

Don’t Clear Away the Bad All at Once

Near the conclusion of the allegory, the Lord of the vineyard instructs his servant to “not clear away the bad thereof all at once, lest the roots thereof should be too strong for the graft” (Jacob 5:65). This is botanically accurate. There is a danger in excessively pruning trees, as it may lead the tree and roots to become “overstressed.”9 Additionally, concern that the “roots thereof should be too strong for the graft” may refer to “excess water and minerals being made available at the deficit of photosynthetic products, because the newly grafted branches would not have enough foliage to photosynthesize and translocate carbon compounds to the roots.”10

Burning Branches and Trees

After the decayed branches of the tame tree were removed, the master of the vineyard proposed that “we will cast them into the fire that they may be burned” (Jacob 5:7). A couple verses later, the master explains that he will do this “that they may not cumber the ground of my vineyard” (v. 9).11

One reason to burn decayed branches is that if they were to remain on the ground surrounding the tree, they would interfere with efforts to prune, dig about, fertilize or otherwise care for the tree, while also creating a space for weeds to grow. Additionally, “Burning is important in order to eliminate parasites and pathogens. Disease-causing organisms could be present in the branches that were removed, necessitating the need to burn them to prevent additional infection.”12 Even the burning of an entire orchard, as described in verses 49 and 77 has its benefits.13

Pruned olive trees. Image via fineartamerica.com.

Conclusion

“In this single chapter of the Book of Mormon,” write Hess and his associates, “there are many detailed horticultural practices and procedures that were not likely known by an untrained person, and may not have been fully appreciated by professional botanists or horticulturalists at the time the Book of Mormon was translated.”14 Thus it is “hard to imagine” that whoever wrote Jacob 5 “was not personally familiar with the minute details and practices involved in raising good olives in a Mediterranean climate.”15

As an ancient Israelite prophet, Zenos would be a plausible candidate for the text’s authorship, seeing that olives were such an important crop in Israel.16 It is harder to ascribe the contents of this allegory to Joseph Smith, who “probably had little knowledge of olive trees in New York, as they will not grow in the northeastern United States.”17

Further Reading
Appendix
Endnotes
Science
Botany and Jacob 5
Botany and Jacob 5 (Pruning)
Book of Mormon

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