Criteria for vegetal species selection
Strategically speaking, the choice and value of drought-adapted species will offer the best chances of successful planting along GGW layout. National experts will  study, amend and complete the indicative list of the vegetal species most adapted to the ecological zones crossed by GGW layout in their respective countries. However, the following recommendations have been made :

• the species adapted to GGW are primarily those that are found there, live and develop there;
• any rearrangements must primarily consider these species the majority of which are found to be resilient,
• the selected species to be introduced in GGW must meet major criteria:
• they must have ecological plasticity such as would allow them to live and develop in ecological zones with up to 100 mm rainfall;

• they must be useful to the needs of the populations;
• they must also be common to many neighboring countries crossed by GGW layout.
• Species selection consists in:
• identifying the species most adapted to arid and semi-arid zones and necessary clues on the conditions of successful production and transplanting of seedlings in the eco-geographic zones crossed by the layout, and in particular, those situated in your country;
• promoting agroforestry as a viable alternative reforestation technique;
• favoring economically profitable existing species and also accepted by the populations especially fruit forests which contribute to the nutritional balance of the populations and poverty reduction;
• taking into consideration the populations’ needs in selection criteria with a view to meeting most of their needs in ligneous and non-ligneous products.