Theophrastus memimpin sekolah Peripatetic selama 35 tahun, dan meninggal pada umur 85, menurut Diogenes. Konon ia berkata "Kita meninggal ketika kita baru mulai hidup." Ia lalu dimakamkan secara besar-besaran, dan "seluruh rakyat Athena, amat menghormatinya, mengantarnya ke kuburnya" (Diogenes Laertius).
Under his guidance the school flourished greatly— there were at one period more than 2000 students, Diogenes affirms— and at his death, according to the terms of his will preserved by Diogenes, he bequeathed to it his garden with house and colonnades as a permanent seat of instruction. [[Menander]] was among his pupils. His popularity was shown in the regard paid to him by [[Philip II of Macedon|Philip]], [[Cassander]] and [[Ptolemy I of Egypt|Ptolemy]], and by the complete failure of a charge of impiety brought against him. He was honoured with a public funeral, and "the whole population of Athens, honouring him greatly, followed him to the grave" (Diogenes Laertius).
*[[Encyclopædia Britannica Edisi Kesebelas]], yang sekarang berada dalam [[domain umum]]
*Sir Arthur F. Hort, ''Theophrastus: Enquiry into Plants'' [[Loeb Classical Library]], 2 vols. 1916 etc.