Lilacs - Outdoors, Containers, or Indoors?





Lilacs (Syringa spp.) are one of the most popular outdoor plants here in Southern Alberta.Their beautiful purple flowers contrast nicely with their abundant leaves, and most people will agree that their easily recognizable scent is just amazing. They can also grow very large, flower often, and are a nice addition to any outdoor space. This makes them a favourite among many.

Lilacs grow well in zones 4 through 9, depending on their species -- There are approximately twelve recognized species of Lilac to date. Here in Calgary we are in zone 4a, and throughout most of the spring, you can’t walk down a neighbourhood street without seeing a lilac bush in someone’s yard. Although they are easy to grow, and happy outside, is it possible to grow them in a container? What about indoors?

Containers:

Generally, the types of lilacs we most commonly see  are only happy when they can spread their roots far out around them - much like most trees. This makes it difficult to keep them in containers, as root restriction will cause them not to bloom, and generally will stunt their growth. There are a few “mini” lilac varieties which may be grown in pots, such as the “Miss Kim” or “Dwarf Pixie” varieties.

Tips for growing small-variety Lilacs in Containers:

Container / Pot
The larger the better - these plants need room to stretch their legs
Strong and heavy weight 
Drainage holes are a must

Soil
Alkaline potting soil -- They can't handle acidic soil

Sunlight
At least six hours of direct sunlight a day

Water
Monitor closely and water when soil dries to a depth of 1 inch
Lilacs do not like to be continuously wet, so only water when the top is dry

Food
Fertilize using a 10-10-10 mixture every couple months

Other
When roots become too large for the container, root pruning will be required


Indoors:

Although some varieties of lilacs can be grown successfully in containers, and may even survive indoors under the right conditions, these plants are not well suited for living indoors. The large amount of space they require to spread out their roots is one aspect of what helps them grow large and bloom successfully. When they are limited to containers, and only receive minimal sunlight, they will generally become stunted and can’t bloom.



Sources:


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