Answer: Your best bet with both annuals and perennials is to choose plants that will thrive in poor soil and need infrequent watering. They will require some more maintenance than when planted on regular garden soil, but if you choose accordingly, you can have a beautiful garden in spite of the sand and salt. First of all, before planting anything, add some organic matter to the soil to give you a bit of an advantage.
As for flower choice, here are a few sugestions. You might also contact your local county extension agent (ph# 508-362-2511 ext. 585) for listings of plants that do well in your conditions, especially native plants.
Achillea sp. - yarrow
Arabis caucasica - rockcress
Baptisia australis - false indigo
Geranium sp. - true geranium
Helianthemum sp. - false sunflower
Gaillardia sp. - blanketflower
Lobularia maritima - sweet alyssum
Ipomoea purpurea - morning glory
Helianthus annuus - sunflower
Zinnia elegans - Zinnia
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