Page 222 - PG 101-Course notes مذكرة النظري 24-25 with spec

Medicinal plants (PG 101) Level 1 Clinical Pharmacy-PharmD

Disadvantages of cultivation:

1. The high cost of production except when carried on large scale.

2. Some medicinal plants require imitation to particular habitat e.g.

- Cannabis requires tropical climate for narcotic resin production.

- Cinchona requires damp hot weather.

- Aloes requires a heavy rain fall.

3. Cultivation may modify the morphological as well as the anatomical

characters of the wild plant so that the identification of the plant becomes

difficult.

Collection of medicinal plants

◦ In order to ensure maximum quality and quantity of their active constituents,

medicinal plants must be collected at the proper time (season as well as the time

of the day) and at the proper stage of development. Certain important factors

must be put into consideration when we are going to collect medicinal plants as:

Factors affecting the collection of the drug:

1- Time of collection:

Time of the year: It has been found that the nature and the amount of active

constituents vary throughout the year e.g. Rhubarb and Rumex are collected in

autumn where the active constituents (anthraquinones) are maximum.

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