1.5cf Sweet Peet. Sweet Peet is the best organic mulch for flower and vegetable gardens because it enriches the soil,transforms into humus, improves tilith, encourages beneficial earthworms and replenishes microbes that are often destroyed by harsh chemicals. Like most Mulches, Sweet Peet surpresses weeds by smothering the soil. But Sweet Peet does more; it is produced to optimize the naturally occuring cat-ion exchange which creates an undesirable growth medium for weeds.