Weitz's never formally studied forestry but his autodidactic perspective was reflective of the period. The forestry strategy he crafted emphasized the economic utility of forests and the importance of the Aleppo pine as the hardiest of local species. As a result, Israel's forests for its first twenty years were largely monocultures which would soon suffer serious losses due to natural pests. Weitz frequently clashed with the nascent conservation movement in Israel which found the industrial approach to tree planting that the Jewish National Fund adopted to be objectionable. Including Pine tree plantations on Mount Gilboa which threatened an endemic plant Iris haynei (also known as Iris Gilboa). Today, many of Weitz's ideas have been replaced with more sustainable approaches to foresting.