Potted Bulb Garden and Cutting Back Perennials


“It would be fun to have specific directions as to how to build a potted bulb garden.    I think it has to sit in the refrigerator (40 degree area) for 12 weeks.

Also you could write about the proper time to cut down perennials.  I’ve heard the new thinking is let them stand until spring (to feed our winter friends) and then chop them down inch by inch to create mulch.

Denise”

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Hi Denise,

Thank you for the email regarding your bulbs and perennials.

Forcing Bulbs

Bulbs made to flower at other than normal times are said to be forced. The practice of forcing is commonly used to flower daffodils, hyacinths, tulips, crocus and other spring bulbs during the winter. With proper planning and care, bulbs can supply color for the home from late November until early April, when they begin to flower normally outdoors.

Steps for forcing include selecting the most suitable varieties, potting bulbs properly in well-drained potting medium, providing proper
cold-temperature treatment, bringing bulbs into a cool room, and placing the plants in a display location when well-developed.

Stage 1:  Preparation
Any spring-flowering bulb can be forced, but to be successful, select types and varieties known to be good forcers. Hyacinths and daffodils are generally the easiest to force. Tulips are slightly more difficult, but with proper treatments they can be forced successfully. Many small bulbs such as crocus, grape hyacinth and snowdrops also may be forced.

The general procedure for forcing all these bulbs is similar. Begin by buying only top-quality, flowering-size bulbs for indoor forcing. Good bulbs contain ingredients necessary for successfully producing roots, leaves and flowers.

Hyacinths are usually the most easily forced spring bulbs. They may be forced in water or potted in a container. Potting should be done in late September or early October. Plants will flower about one month after being brought indoors from the chilling treatment. Earliest bloom from bulbs can be expected about mid-January.

Many varieties of daffodils can be forced. Paperwhite Narcissus are suitable for earliest forcing either in pots or in water.

All varieties should be potted before the end of October for adequate root growth and chilling. Dates listed in the table are the earliest that bulbs planted in October should be brought into forcing conditions. Most varieties flower about one month after being brought indoors, although timing varies due to varieties and individual forcing conditions.

Hyacinth varieties for forcing:
Variety        Color        Pot no later than    Earliest date to bring indoors
Anne Marie        bright pink    Oct. 1            late December
Delft Blue        porcelain blue    Oct. 1        late December
Jan Bos        red        Oct. 1            late December
L’Innocence        white        Oct. 1            late December
Carnegie        white        Oct. 1            early January
Myosotis        pale blue    Oct. 1            early January
Ostara            dark blue    Oct. 1            early January
Pink Pearl        pink        Oct. 1            early January
City of Harlem    yellow        Oct. 15        mid-February
King of the Blues    deep blue    Oct. 15        mid-February
Lady Derby        rose pink    Oct. 15        late January
Orange Boven        orange-salmon    Oct. 15    late January

Daffodil (Narcissus) varieties for forcing.
Variety        Color                Forcing dates
Accent            white; salmon cup        March to April
Barrett Browning    white; orange cup        January to April
Bridal Crown        golden yellow        March to April
Carlton        double white; orange center    January to February
Cassata        creamy to pale yellow    January to April
Dutch Master        golden yellow        January to April
February Gold    bright yellow        January to February
Flower Record    white; orange-rimmed cup    January to February
Fortune        yellow; coppery-orange cup    January to April
Ice Follies        white; yellow cup        January to April
Las Vegas        white; lemon yellow cup    January to April
Mt. Hood        ivory white            January to April
Tete a Tete        yellow miniature        January to February
Unsurpassable    yellow                March to April

Tulip varieties for forcing.
Variety        Color                Earliest date to bring indoors
Apeldoorn        orange-scarlet        early February
Apricot Beauty    salmon-rose            early January
Attilla        purple violet        mid-January
Bellona        golden yellow        early January
Blizzaard        creamy white            early February
Christmas Gold    deep yellow            early January
Christmas Marvel    cherry pink            early January
Couleur Cardinal    cardinal red            early February
DeWet (General)    orange                early January
First Lady        reddish-violet        early January
Garden Party        white-edged red        early February
Gudoshnik        pale yellow streaked; rose pink    early February
Jewel of Spring    yellow-streaked red        early February
Kansas            white                early January
Make Up        white with red edge        early February
Merry Widow        red with white edge        mid-January
Olympic Flame    yellow-flamed red        early February
Orange Nassau    double-orange scarlet    mid-January
Orange Wonder    bronzy-orange        mid-January
Paul Richter        scarlet red            early January
Peach Blossom    double deep rose        early February
Preludlum        salmon with white base    early January
Queen of Sheba    mahogany-edged orange    early February
Westpoint        yellow                early February

Stage 2:  Potting

The following materials will be needed for potting bulbs:
–Pots 4 to 8 inches in diameter. Short pots known as azalea or bulb pots are preferred.
–A well-drained potting medium such as a blend of Sphagnum peat, vermiculite and perlite. High fertility is not essential, but good drainage is important. No fertilizer is needed at potting time.
–Wood, plastic or metal labels.
–Thermometer for checking temperatures.

Procedure
All bulbs are normally potted in October.

*Add enough soil mixture to fill the pot so bulbs are placed as follows:
–Hyacinths and tulips: Allow only the tip of the bulb to show above the soil line.
–Daffodils: Plant so about one-half of the bulb shows above the soil line.
–Small bulbs (crocus, snowdrop, grape hyacinth, etc.): Plant so they will be about one inch below the soil line.

*Set the bulbs in the pot. One large bulb may be placed in each 4-inch pot.  Use six tulips, three hyacinths, five daffodils or 15 crocus (or other small bulb) in each 6-inch pot. All bulbs in a pot should be of the same kind and variety to ensure uniform flowering. Place tulips with the flattened side of the bulb toward the outside of the pot.

*Fill around the bulbs with potting medium to the proper height. Firm the medium with light pressure, but avoid tight packing. After planting, the final potting medium line should be about 1/4 to 1/2 inch below the rim of the pot.

*Label each pot with variety of bulb, date of potting and expected date to begin forcing.

*Add water until it drips through the drainage hole in the bottom of the pot. After about one hour, dump out any water remaining in the saucer.

Stage 3:  Rooting
After potting, keep hardy bulbs where temperatures range between 35 and 48 degrees F; 40 degrees F is ideal. These temperatures may be found in a cool north room, basement, crawl space, bulb cellar, outdoor trench, refrigerator or cold frame.

An unheated basement or storage cellar is most convenient because temperatures don’t fluctuate greatly and the cooling is quicker and more satisfactory. An old refrigerator may be used for a few bulbs.

A cold frame is easily built outdoors and may later be used for other gardening activities. Place the pots to be forced in the cold frame and cover them with sawdust, straw, leaves, peat moss, shredded styrofoam or other material. The cold frame should be in a shady place or on the north side of a building so the soil is as uniformly cool as possible in October and November. No sash is needed on the cold frame.

When preparing only a few pots, place them on the surface of the ground close to a building. Cover them with peat moss, leaves, straw or similar material and invert a box or bushel basket over them for protection.

Bulbs stored outdoors will normally get sufficient moisture from the soil around them after initial watering. Indoors, bulbs should be kept moist at all times. Overwatering, however, may cause bulb rot.

Roots should develop soon after potting. Excellent root growth is essential to good growth and flower formation. Potted bulbs should be placed outdoors at least three weeks before the first hard freeze is expected. This is an important period for good root development.

Stage 4:  Top-growth

A few varieties may be brought indoors after about 12 weeks of cooling, but most will require 13 or 14 weeks to develop the necessary roots and top growth. Indoor forcing takes three to four weeks. To extend the bloom period, remove potted bulbs from storage at weekly intervals.

If potting medium and tops are frozen when plants are brought indoors, place plants in a cool room (about 40 degrees F) for two or three days to thaw out slowly. Don’t touch the plant tops when they are frozen.

If plants are not frozen, bring them directly to a cool, bright window where temperatures range close to 60 degrees F. Don’t place them in direct sunlight. Keep bulbs watered, but fertilizer won’t be needed.

Stage 5:  Bloom

When flower buds are almost fully developed, pots may be moved to the area in the house where they are to be displayed. Avoid placing them in full sunlight or close to a heater. The life of the flowers can be lengthened by placing the plants in a cool room at night.

Bulbs that have been forced indoors are usually of little value for outdoor planting afterwards and should be discarded.

Forcing bulbs in water

Tender types of Narcissus such as Paperwhite and Soleil d’Or don’t require cold treatment before being forced into bloom. These are the most popular and dependable bulbs for forcing and may be grown in water with pebbles for support.

Hyacinths can be forced into bloom in containers that will support the bulb with only its base touching the water. Bulbs should be cleaned before placing them in glasses. The best time for starting the bulbs is in October.

Keep the glasses containing the bulbs in a cool (45 to 50 degrees F), dark location until tip growth is 3 to 4 inches long and the flower cluster emerges free from the bulb. This may take 8 to 12 weeks. When the top growth is well-developed, move the glasses to a cool, bright window.

As for your perennials, you can chop them down if they herbaceous (not recommended for roses or other woody perennials that come back on the same stems/foliage).  However, the only thing to keep in mind is to wait until the foliage had died back.  If the stems or leaves are still green, the foliage is still feeding the plant and preparing it for winter.

I hope this information helps you out.  If you have any other questions, please feel free to ask.

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© Mertie Mae Botanics LLC and Horticulture Talk!, 2015. Unauthorized use and/or duplication of this material without express and written permission from this blog’s author and/or owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Mertie Mae Botanics LLC and Horticulture Talk! with appropriate and specific direction to the original content.

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