Drainage In Large Containers
All containers need to be given adequate drainage, but you must take extra care with winter containers to avoid damaging the bulbs. Choose a soil based potting compost or soil mix or use a peat based compost and add extra grit, in the ratio of approximately three parts compost to one part grit, in the ratio of approximately three parts compost to one part grit.
It is important to plan before you plant. Think of the overall shape you want to achieve and consider the height and spread of the plants in relation to the depth of the container.
The drainage layer will also help to prevent the roots of the plants from blocking the drainage holes, which are sometimes too small in relation to the size of the pot.
If there is room, include a shrub or conifer in the center to give added structure, or use Hedera or ivy or Vinca or periwinkle to soften the edges of the container and make a pleasing shape as they trail.
Consider also when you would like the container to look its best. If you want an explosion of color in mid spring, use daffodils or tulips with pansies. For a later splash of color, use late flowering tulips with pansies, forget-me-nots or wallflowers, which are available in a wide range of colors that complement almost any choice of tulip.
Although they will not start flowering until mid spring, they will provide greenery, and once they start to flower the show will last for many weeks. Drill six drainage holes in the base of the half barrel.
Line the base and sides with a bin liner or trash bag or black plastic. Cut slits in the liner to match the drainage holes. Add a 7.5cm layer of drainage material, such as pieces of polystyrene or Styrofoam. Fill to about two thirds full with potting compost or soil mix.
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