Iris reticulata

PLANTING SPRING-FLOWERING BULBS

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I have three pictures above depicting flowers of heirloom bulbs.  The double daffodil is ‘Van Sion’ dated 1620.  The hyacinth is ‘General Kohler’ a rare double hyacinth from 1878. The tulip is an old Cottage-type tulip with variegated petals.  This type of tulip was much loved in the Dutch golden age in the 1600s.  Many tulips, hyacinths and daffodils still exist from hundreds of years ago, but are quite rare now.  It is important to keep growing and propagate them so they will not be lost forever!  I am going to list methods of culture and planting for spring-flowering bulbs in this article.

The best time to plant spring-flowering bulbs is when soil temperatures drop below 60 degrees.  In Montana this may occur as early as in August, but because of our frequent fluctuations in temperatures, October or early November is the best time.   Many spring bulbs establish root systems in the fall while the soil is not yet frozen.  If necessary, bulbs can be planted right up until the ground freezes, but will bloom better if you get them in earlier.

Bulbs prefer a well-drained location in the garden.  Tulips, hyacinths, and grape hyacinths need full sun.  Daffodils, snowdrops and glacier lilies (trout lilies) like part shade, though daffodils will grow in full sun in Montana and other cool areas of the Northwest.  Daffodils are deer and rodent proof, but most others, especially tulips, need to be in a place protected from deer and voles.  Dig your soil about 10 or 12 inches deep.  Sandy loam is the best soil for bulbs, but you can improve your soil.  Add gypsum to break down clay; peat moss or compost will also help.  Bone meal is excellent food for bulbs.  It adds phosphorous, which promotes larger and more numerous blooms.  Mix bone meal well with the soil in the bottom of the bed for best results.  Soil pH should be about neutral for these bulbs, but hyacinths and tulips will tolerate more alkaline soils.  Plant tulips and daffodils at 5 bulbs per square foot, hyacinths and glacier lilies at 3 to 4 per square foot, and grape hyacinths at 8 to 10 per square foot.  After planting, backfill the soil but do not pack it down over the bulbs.  Water the bed well.  A winter mulch of evergreen branches will help protect your bulbs over winter.  Straw is not a good mulch for bulbous plants because as it rots down it attracts disease carrying organisms like botrytis and mold.

The general recommended planting depth for bulbs is three times the height of the bulb deep; pointed end up.  Tulips, hyacinths and daffodils should be planted about 6 to 8 inches deep, grape hyacinths and glacier lilies about 4 inches deep.

Leave foliage on your bulbs and let it die down naturally.  This feeds the bulbs and helps them to flower well next year.  Most bulbs, especially tulips, like dry soil conditions after foliage dies down.  In some climates, or if summer bedding is planned for that location, people dig and store their tulip bulbs and replant them in fall.  Here in Montana, you can leave the bulbs in the ground if you give no additional summer water.  Do not water them until October.  To give the roots a boost before winter, spread bone meal over your bulb beds before you water.  Glacier lilies and a few other bulbs like to grow in moist soil, but can tolerate dry soil conditions for a short period during late summer.

Some of the First Flowering Bulbs of Spring

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The three flowers above are the first to bloom in my garden this year.  The first photo shows blooms (from left to right) of: Galanthus nivalis flore pleno, the double snowdrop; Iris reticulata; and Muscari botryoides, the grape hyacinth.  The snowdrop and the iris were planted last fall (2015) and the grape hyacinths were here in the garden from times past.

The double snowdrop is a beautiful flower, having rows of green and white petals that resemble the old-fashioned layered petticoats worn in the nineteenth century and before.  The single form was known in ancient times and is described by Theophrastus.  It is illustrated in Gerard’s The Herball of 1596 and was considered a type “bulbous violet” at that time.  The double form, illustrated above, occurred in  the eighteenth century.  It blooms slightly later than the single form, but is quite unusual and uncommon today.  G. nivalis is native to Europe and likes cool, rather moist conditions and cold winters (USDA zones 3-8).  I have mine planted in part shade under a Pieris tree.   Snowdrops have a faint, earthy fragrance and will begin to bloom as soon as the snow melts.

Iris reticulata, which does not seem to have a common or folk name, is native to Turkey, Iran and the Caucuses Mountains.  Bulbs reached Europe and North America in the mid-nineteenth century; nowadays several forms and colors are available.  The flowers have an unusual violet-like fragrance.  The plant is beautiful and undemanding, preferring full sun, rather alkaline, gritty soil and dry conditions in summer.   I. reticulata thrives in USDA zones 4-9 and multiplies well.

Muscari botryoides is the original “grape hyacinth” known since at least 1596 and is illustrated in Gerard’s Herball.  It resembles the commonly grown Muscari armeniacum, but blooms earlier.  It is hardier as well, growing in USDA zones 2-8.  M. botryoides has sterile upper flowers which are lighter in color than those below.  The flowers have a fragrance of honey.   M. botryoides has almost disappeared from modern bulb catalogs, but if you search, you may fnd it growing in old established gardens, or around abandoned home sites.  I am lucky that it was planted in the garden of my house, built in the 1920s.  The flowers are just opening here in mid-February.