If the same type of plant is not in bloom in your area (don't know where you
are) the plants in the stores are forced into bloom for the holiday season.
That means they are weaker than flowers planted at the normal time in your
area (in the NE US - thats in the fall for the items mentioned)

Being forced, you may or may not get blooms next growing season - and if you
get them, they probably will be smaller and weaker than any bulbs planted
fresh in the fall.

Depending on your plans for your garden and your desire for good flower
coverage - those inexpensive plants might not be worth the cost.

JonquilJan

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