Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Amorphophallus bulbifer - Devils Tongue - 5 seeds
Product description: The devil's tongue (Amorphophallus bulbifer) is native to northeastern India and is absolutely hardy. The dark green leaves and spotted stems are very showy. Also the flowers of the devil's tongue are very attractive. The spathe is 20 cm long with greenish lines and spotted pink outside, rose in the throat and becoming flesh colored upward inside.
Product feature: fresh & viable seeds, germination instructions included, please provide a "small lots of seed permit" from APHIS (US customers only)
Product brand: Exotic Plants
Target attributes: Sustainability
Answer: attribute: sustainability
value: None
source: None