The Jewish National Fund (JNF) was established at the Fifth Zionist Congress for the purpose of land purchase in Ottoman-controlled Palestine. JNF succeeded in attracting worldwide grassroots support via the sale of stamps and collections from the now-iconic blue boxes. In 1908, the first JNF trees were planted in memory of Theodor Herzl. With the expansion of JNF’s tree-planting and afforestation program in 1920, the purchase of JNF trees became a popular gift to mark milestones.