Forcing

​Late summer is the ideal time to plan for your early spring forcing.  Most of us are familiar with forcing springs bulbs such as paper whites, tulips, and daffodils.  But what about forcing rhubarb, foam flower, and forsythia?   Enjoy the joys of gardening before the snow melts next March…or April…or May!

​ Spring Bulbs    Most spring bulbs need a 12-15 week chilling period.  Try dwarf species or hybrids for the best results.  I plant mine in potting soil in nursery pots and put them in the vegetable crisper and covered with plastic to keep in the moisture.  Be sure to label with the date and species.  Paper whites are the exception needing no chilling period.  I keep those bulbs in the fridge unpotted.   When you are ready for some blooms, bring them out.  You can repot in an attractive container and water.  Don’t water again until growth begins.  I water with 7 parts water and 1 part alcohol (I use an old bottle of vodka) to keep them from flopping. 
 Rhubarb   You can freeze stems for use during the fall and winter.  But if you forgot and need to divide your rhubarb now is an excellent time to not only divide but get rhubarb next spring weeks before it is ready in the garden.    According to Rhubarb-Central.Com ( http://www.rhubarb-central.com/forcing-rhubarb.html)   “the cultivation methods for forcing rhubarb was developed as early as the 1800's. Commercial growers of rhubarb use special forcing sheds, or hot houses, but the home gardener can successfully force rhubarb in a home cellar, a garage, or another outbuilding.  Forcing rhubarb can also be done outdoors, in the garden.”  The process is a bit involved and I recommend that you do some research before proceeding. 

​Perennials   According to Tovah Martin in The Unexpected Houseplant,  “Foam flowers (Tiarella cordifolia)   are disarmingly easy to grow indoors.  They often blossom a month or more before their leaves begin to emerge outside and they stay in bloom for a long duration of fulfillment.”  Now is the time to dig up and pot some to bring indoors.  They like indirect light and just enough moisture so they don’t dry out.    Other perennials that make good winter houseplants are Coral Bells (Heuchera) and Sea thrift (Armeria maritime).   If you plan to travel south this winter, plan to stop at a nursery on your way home and pick up a perennial that you can enjoy in the house early and then plant in the garden later.  Try Bleeding heart (Dicentra Spectablis), and Lenten Rose (Helleborus) for a good-looking plant that blooms and makes a fine temporary houseplant.  
Trees and Shrubs    We are familiar with gathering pussy willows in the spring and watch them bloom.  You can do the same with a number of spring blooming shrubs and trees.  Many ornamental trees and shrubs set their flower buds during the previous growing season and need a period of dormancy of about six weeks.  The buds usually open about 2-3 weeks after being exposed to warmth and moisture.  If you are pruning in later winter, pick a day when the temperature is above freezing to help the branch make the transition to indoor temperatures.   If you force a branch without success, try again a few weeks later.  Forsythias, Witch hazels, cherries, lilacs, Rhododendron, Serviceberries, Birches, Red Maple, and Willows can all be forced.