Answer: Your zip code places you in zone 5A or the coldest part of zone 5. Depending on your microclimate it might actually be as cold as zone 4. Rosmarinus officinalis 'Tuscan Blue' is only winter hardy to zone 8 so in your area you would need to grow it as a container plant and bring it indoors as a houseplant each winter. Silverberry is the common name for several types of Eleagnus, most of which are hardy to zone 7 and a few to zone 6. So, unfortunately, neither of these would be a good choice for landscaping in your area. Your local professional nursery staff and/or county extension should be able to help you identify plants that would grow well in your local area. I'm sorry I can't be more encouraging about these two.
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