We have carefully selected our best plants for you and shipped them as securely and quickly as possible to you.  While we cannot guarantee how they will fare after they are out of our hands, with the multiplicity of weather, soils, etc. in this large country, here are some care & planting suggestions that should help them and you succeed.
Please unpack promptly, check to see if plants need watering, and set in a bright cool airy place out of direct sun and wind while you prepare to plant them.  Plants whose roots are wrapped in plastic will need to be opened a bit so air can circulate, or potted up temporarily if you can't plant immediately.  Be certain to use a well drained soil mix and pot if you do so.
(A good way to check soil for watering is to stick a pencil down in the pot a few inches, and wipe it on your fingers when you pull it out of the pot.  If the pencil is wet or damp, watering is not needed.)
If you cannot plant them immediately in the garden, keep them in the shade, in a cool greenhouse or cold frame or on a cold but not freezing porch in the mean-time.  Woody plants that are dormant upon arrival may take some time to awaken and put on new growth.  Roses and other woody plants which have not leafed out yet may need sweating, which means keeping them in a close (very humid) and cool environment for a few days to a week or so in order for the leaf buds to open.  The plants then will need to be gradually re-introduced to a drier environment over several days.
The plants (and you!) will be happier if you plant in the cool of the day. 
Dig a hole a good chunk larger than the plant is now, amend with your favorite compost (don't use a fast release fertilizer! especially not in hot weather!) and place your new plant in the hole, at the same level it had been growing at before.  Settle the plants in, firm up around them, and water well to thoroughly soak the soil around them. 
Your new plants will need you to check them for water daily at first (though they may not need watering), as they need time to get established in your garden.
 If the days are sunny/windy, some temporary shade or wind break may be appropriate.  Burlap, floating row cover, sheer fabric all work well. 

We recommend a nice crunchy humusy soil for our alpines, (Penstemons & the like), with grit, leaf mold, well composted bark, etc.  A collar of small gravel around the neck of the plant will keep off excess wet while keeping in soil  moisture.   A sloping or mounded site will also protect them from excessive winter wet.  Meconopsis and Delphiniums especially need their necks above the water table.
This  is also appreciated by many sun-loving plants such as Agastaches, Lavender, Dianthus, Sages and Delphiniums.  While Lavender is not a heavy feeder, Delphiniums and Peonies definitely are and will repay you well for extra compost & phosphate rock as the years go by.
Shade lovers will benefit from increased leaf mold, compost, and fluffy (well aerated) woodland soils.  Ericaceous plants (acid lovers like Huckleberries) & strawberries, etc.) appreciate peat moss or other non-limy soil.
We also recommend singing and dancing while planting, if the mood strikes. 

For further gardening information we recommend the following books:
The New Garden Encyclopedia 1943 Victory Garden Edition, E. L. D. Seymour, ed.
Taylor's Encyclopedia of Gardening, Norman Taylor ed.
An Encyclopedia of Gardening, W. P. Wright (1911)
The Sunset Western Garden Book     

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Caring for your new plants
from Paradise Gardens Rare Plant Nursery