Spring-blooming bulbs may be planted in masses among the plants, such as narcissus, scillas, snowdrops, chionodoxas, grape hyacinths, and crocuses. These blossom early and do not interfere with the regular rock-garden plants. Tulips and Dutch hyacinths should never be planted in a rock garden; such highly developed forms are out of place as much as a Japanese chrysanthemum would be in a wild garden.

The whole rock garden should be enclosed with either flowering shrubs or evergreens planted in masses. These give seclusion and shelter from cold winds, and in their shade native ferns may be planted.

The approaches to a rock garden should not be too abrupt; a few rocks placed outside along the path leading to the rock garden, and also among the shrubs which enclose it, help to give it a much more natural appearance.

The propagation of alpine and other plants suitable for rock gardens is simple. All may be raised from seeds, and most of them by cuttings or division of the plants. The writer raises his plants from seeds sown in February, in four-inch pots of light sandy soil, in a warm greenhouse. The seedlings are transplanted as soon as large enough to handle, and gradually given more air as they increase in size. By the end of April they are usually large enough to plant out permanently in the rock garden. If one does not have a greenhouse, the seeds may be sown in a coldframe, in shallow drills, in April, and transplanted to the rock garden in early fall.

The whole rock garden should be replanted and given fresh soil about every four or five years. The general care required is usually less than for an ordinary flower garden. In dry weather in summer the plants should receive water at least once in two days, and in winter the plants which overhang ledges of rock should be protected with branches of hemlock or pine.

Following is a list of some of the plants most suitable for a rock garden, the majority of which the writer has proved to be hardy in New England.

Some Of The Best Of The True Alpines

Androsace alpina.

" sarmentosa.

Anemone alpina Antennaria alpina Aquilegia alpina Armeria alpina Cerastium alpinum Cheiranthus alpinus Campanula Garganica " muralis pulla " rotundifolia.

" turbinata.

Waldsteinii Dianthus alpinus " glacialis.

Gentiana verna.

Geum montanum.

Globularia nana.

Leontopodium alpinum (Edelweiss).

Linaria alpina.

Lychnis alpina.

Potentilla aurea.

Primula Mistassinica.

Reseda glauca.

Saxifraga cæsia.

" Cotyledon.

" var. pyramidalis " crustata " geranioides " longifolia " oppositifolia.

A glimpse of the rock garden at the home of Professor Charles Sprague Sargent.

A glimpse of the rock garden at the home of Professor Charles Sprague Sargent.

Dianthus petræus Doronicum glaciale Draba alpina Epimedium alpinum.

Silene acaulis Soldanella alpina Veronica alpina.

Plants For Overhanging Ledges

Ajuga Genevensis.

" reptans Antennaria plantaginea Anthemis nobilis Arabis albida Aubrietta deltoidea Cerastium Bierbersteinii " purpurascens.

" tomentosum.

Daphne Cneorum Linnæa borealis var. Americana Mitchella repens Phlox reptans.

Phlox subulata alba.

" atropurpurea Sedum acre.

" album.

" Hispanicum.

" purpureum.

" Sieboldi.

" " var. variegatum.

" ternatum Stellaria graminea " Holostea Veronica rupestris Vinca minor.

Plants Most Suitable For The Deepest Recesses

Anemone Japonica Convallaria majalis Cornus Canadensis Cypripedium parviflorum " pubescens.

" spectabile.

Dicentra spectabilis Dictannus albus Funkia lancifolia.

" " var. albo-marginata.

" ovata.

" Sieboldiana Helleborus niger.

Lobelia cardinalis " syphilitica Orchis latifolia Pachysandra terminalis Polygonatum biflorum Saxifraga crassifolia Tiarella cordifolia Trillium cernuum " grandiflorum " sessile Uvularia grandiflora Viola Canadensis " striata.

Plants For Conspicuous Positions

Acanthus mollis.

Acanthus candelabrum.

Aquilegia Canadensis " cærulea.

" Olympica.

Dictamnus Fraxinella Digitalis purpurea Eryngium planum.

Fritillaria imperialis Lychnis Chalcedonica Papaver nudicaule.

" orientale Spiraea Aruncus Verbascum Chaixii.

Plants To Be Used In Pockets

Achillea tomentosa.

" Ptarmica var. flore pleno Adonis vernalis Allium Moly Alyssum argenteum.

" saxatile Anaphalis margaritacea Anemone patens var. Nuttalliana.

Pulsatilla Arenaria Balearica.

" graminifolia Armeria maritima.

" " var. Laucheana.

Asarum Canadense.

" caudatum Campanula Carpatica " persicifolia.

Ceratostigma plumbaginoides Colchicum autumnale Coreopsis rosea Corydalis glauca nobilis Cotyledon spinosa Dianthus atrorubens.

" fragrans.

" plumarius.

Dicentra Canadensis.

" cucullaria Dodocatheon Meadia.

Doronicum Caucasicum Draba incana var. arabisans Dracocephalum nutans Epigæa repens-Galax aphylla Gentiana acaulis.

" Andrewsi.

" Saponaria.

" verna.

Geranium Robertianun Gypsophila repens Helianthemum lavandulæfolium.

" vulgare.

Hepatica acutiloba triloba Heuchera sanguinea Iberis sempervirens.

" Tenoriana Iris pumila.

" verna Leucojum aestivum Linum perenne Lotus corniculatus Lychnis Viscaria var. splendens Mertensia Virginica Oenothera Missouriensis Ornithogalum umbellatum Platycodon grandiflorum var. Mariesii Polemonium humile.

A bit of nature like rock gardening on the Hunnewell estate.

A bit of nature-like rock gardening on the Hunnewell estate.

Polemonium reptans Potentilla Sibbaldia " splendens.

Primula elatior " farinosa " officinalis " vulgaris Prunella grandiflora Pyrola rotundifolia Rhazya orientalis Rhexia Virginica Sabbatia campestris Sagina procumbens Saxifraga aizoides " Aizoon.

" granulata.

" umbrosa.

Scilla Sibirica Sedum roseum.

Sedum spectabile Sempervivum arachnoideum " fimbriatum.

Pomelii " tectorum.

Shortia galacifolia Silene Zawadskii Statice Gmelini Stokesia cyanea Trautvetteria palmata Trollius Asiaticus.

" laxus Tunica Saxifraga Veronica gentianoides " incana Ponæ " spuria Viola cucullata Waldsteinia fragarioides.

Plants For Moist Places

Calla palustris Lobelia cardinalis " syphilitica Myosotis palustris Parnassia Caroliniana " palustris.

Pinguicula vulgaris Potentilla palustris Saxifraga Pennsylvanica Spigelia Marilandica Spiranthes cernua Ranunculus flammula.