average cost of a perennial
1 A 100 milligram packet of daisy perennial seeds can retail for $1.50 to $3.50. 2  At a local big name store such as Loweâs or Home Depot, one gallon perennials can be found for $8 to $18 depending on the time of the year. 3  During the peak season, the price may be higher than the end of the season. A 100 milligram packet of daisy perennial seeds can retail for $1.50 to $3.50. 2  At a local big name store such as Loweâs or Home Depot, one gallon perennials can be found for $8 to $18 depending on the time of the year. 3  During the peak season, the price may be higher than the end of the season.