The Slipper Orchid Alliance


CYPRIPEDIUM CULTURE

Cultural information for:

     •     Cypripedium parviflorum

Soil media: two parts black (sedge) peat, one part sand, two-three parts perlite. Mulch with shredded leaves, one inch deep. In pots, coarse vermiculite may be used, and is recommended for seedlings.

Light conditions: light shade to high open shade.

Moisture requirements: keep soil damp at all times. Must be well drained.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July. Flush media with water before next application.

Planting: plant with growth bud just covered or partially exposed. Roots should spread out flat with the tips slightly downward.

Hardiness: very hardy, however, buds are damaged where thaw occurs in mid-winter. Mulch with heavy cover of shredded leaves to protect new buds and reduce effect of thaws where planted out-of-doors. Remove most of mulch in spring. Recommend pot culture for areas south of Missouri, with at least three months artificial cooling. Artificial cooling can be readily achieved by placing pot in plastic bag and placed in the crisper of the refrigerator for the required time.


Cultural information for:

     •     Cypripedium pubescens

Soil media: General deciduous woodland soil is best. Add some peat and shredded dead leaves to garden/loam soil to prepare for planting. Mulch with shredded dead leaves.

Light conditions: light shade to high open shade (70% shade cloth is satifactory).

Moisture requirements: keep soil damp. Likes to be a little drier late in the season. Must be well drained.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July.

Planting: plant with growth bud an inch or so below the surface. Roots should spread out flat with the tips slightly downward.

Hardiness: hardy in beds. Mulching is recommended. Not generally recommend for pot culture.


Cultural information for:

     •     Cypripedium acaule

Soil media: 50% silica sand, 30% sphagnum peat, 20% acidic rotten wood chips (alternate to 50% acidic rotted wood chips, 50% sphagnum peat). Use plastic pots only.

Light conditions: light shade to high open shade.

Moisture requirements: water with distilled or rain water to which has been added 2 ounces of cider vinegar per gallon of water. Keep soil damp at all times. Must be well drained.

Fertilizing: none recommended.

Planting: plant with growth bud just below the surface. Roots should spread out flat with the tips slightly downward.

Hardiness: hardy in beds. Mulching is recommended. In pot, four months of artificial cooling is recommended, though three may be sufficient. Artificial cooling can be readily achieved by placing pot in plastic bag and placed in the crisper of the refrigerator for the required time.


Cultural information for:

     •     Cypripedium candidum, Cyp. reginae, Cyp. Andrewsii

Soil media: A mix of one half black sedge type peat and one half soil is very satisfactory. Perlite may be added to lighten it a bit. Sand may also be added to the media, especially for Cyp. candidum. Mulch with grass clippings. In pots, coarse one half vermiculite, half coarse perlite may be used, and is recommended for seedlings.

Light conditions: light shade to high open shade (70% shade cloth is satifactory). Though they grow in full sun in the wild, under cultivation they do not need that much light. It also reduces the moisture demand which is by far greater with more light.

Moisture requirements: keep soil moist at all times, but not wet. They need more moisture in early spring when they begin growth.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July. Flush media with water before next application.

Planting: plant with growth bud covered. Roots should be spread out flat with the tips slightly downward.

Hardiness: hardy in beds. Mulching is recommended. In pot, four months of artificial cooling is recommended, though three may be sufficient. Artificial cooling can be readily achieved by placing pot in plastic bag and placed in the crisper of the refrigerator for the required time.


Cultural information for:

     •     Cypripedium montanum

Soil media: a mix of one half garden soil and one half course builders sand (or perilite). Mulch with rotten wood or wood chips. Drainage is the most important detail for these plants. PH: around neutral, will accept a little below and a little above.

Light conditions: morning sun until 10 AM in the northern parts of the US. Shade to filtered shade in other parts of the US.

Moisture requirements: keep moist during active growth and flowering. Reduce the quantity of watering in July and August after active growth has ceased.

Fertilizing: None.

Planting: prepare a planting site 12" deep and 12" across. Set the plant accordingly with root growth. Plant the top of the bud 1 to 2 inches deep.

Hardiness: hardy in beds. Need at least 2 months of 35 degree winter temperatures. Depths depends on a reliable snow cover. If snow cover is not reliable, plant on the deeper side and mulch with 6" of material for the winter. Remove in the spring. Becareful of removing the mulch to soon, as the flower buds can be frosted off. For areas that have freeze thaw cycles in the spring, mulch heavily 12" or more after the ground has frozen or near frozen in the fall.


Cultural information for:

     •     Cypripedium Barbeyi, Cyp. Gisela, Cyp. Aki, Cyp. Philipp and similiar hybrids

Soil media: "Q-Mix" (1 part loam soil, 2 parts gritty sand, 2 parts fine fir bark, 1 part shredded leaves). Silica sand may be substituted for the gritty sand, and up to one third of the sand portion may be perlite. Mulch with shredded leaves. In pots, coarse vermiculite may be used, and is recommended for seedlings.

Light conditions: light shade to high open shade (70% shade cloth is satifactory).

Moisture requirements: keep soil damp at all times, but not wet. They need more moisture in early spring when they begin growth. Must be well drained.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July. Flush media with water before next application.

Planting: plant with growth bud covered. Roots should be spread out flat with the tips slightly downward.

Hardiness: hardy in beds, but tend to come up quickly in spring, occasionally suffering frost damage. Mulching is recommended. In pot, four months of artificial cooling is recommended, though three is most often sufficient. Artificial cooling can be readily achieved by placing pot in plastic bag and placed in the crisper of the refrigerator for the required time.



Cultural information for:

     •     Cypripedium kentuckiense, Liparis lilifolia

Soil media: fine, dust free sand (flint or silica sand used for sandblasting). Mulch with shredded leaves, one half inch deep or seedling size fir bark.

Light conditions: full shade to high open shade.

Moisture requirements: keep soil damp at all times, but not soaking. Must be well drained.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July. Flush media with water before next application.

Planting: plant the rhizome with the roots curved downward. Tip of growth bud should be 1/4 to 1/2 inch below surface of soil media. Plant corn one inch below soil surface. In pot, use one with plenty of space - six inch or better.

Hardiness: hardy in beds, however should be mulched. In pot, four months of artificial cooling considered minimum. Artificial cooling can be readily achieved by placing pot in plastic bag and puting in the crisper of the refrigerator for the required time.


Cultural information for:

     •     Cypripedium guttatum, Cypripedium yatabeanum

Soil media: three parts sand, two parts milled sphagnum moss, one part sphagnum peat, 1/3 part charcoal chips. Mulch with shredded leaves or partially rotted pine needles.

Light conditions: bright open shade.

Moisture requirements: keep soil moist at all times, but not soaking. Must be well drained.

Fertilizing: general all-purpose fertilizer at 10-25% strength recommended for pot plants. Apply every three or four weeks up to mid-July. Flush media with water before next application.

Planting: plant the rhizome with the roots spread out, one and a half to two inches below surface of soil media.

Hardiness: very hardy. Requires lengthy cold dormancy period. Not recommended for areas south of Iowa.


Carson E. Whitlow

CYP. HAVEN

22957 - 280th Street

Adel, IA 50003-4491

Phone: (515) 993-4841

Fax: (515) 309-2302

E-mail: slipperguy@aol.com