Longevity of seed

• It is the duration of viability of the seeds.
• In general, seed viability is governed by external environmental factors to which the seed is exposed following maturation.
• According to longevity, seeds are categorized into 3 classes;

1. Macrobiotic seeds (retain viability for >15 years often due to water proof seed coat): Ex- Lotus (Nelumbo nucifera), Chenopodium album.
2. Mesobiotic seeds (retain viability for 3-15 years)
3. Microbiotic seeds (retain viability for <3 years): Ex- Oxalis seed die within 3 days.