Planting (IMAGE) Frontiers Caption Planting Abies religiosa (Sacred fir) seedlings under the shade of pre-existing shrubs (Senecio cinerarioides, narrow green-greyish foliage) as protective “nurse plants”. Large trees on background are adult Pinus hartwegii, the pine that reaches the timberline. Abies religiosa is completely absent in this site at 3800 m of elevation, northeaster slope of Nevado de Toluca volcano, central Mexico, because it is too high in elevation. Planters personnel are locals of Native Indian origin. Credit Cuauhtémoc Sáenz-Romero, UMSNH Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.