Purple Fountain Grass Plant / Aclk Sa L Ai Dchcsewjd7swtttb0ahuqqhckhzcmazoyababggjlzg Sig Aod64 2cqniig8dazauwam90iwt93fp0aa Adurl Ctype 5 : Since mature plants can reach about four feet tall (1 m.) and just as wide, they should be given plenty of room in the garden, spacingĀ .