Most varieties bloom well every other year. Transplanting or moving a shrub disrupts this natural cycle. That the white one is doing well speaks to the differences that occur among varieties of the same plant. Depending on who is counting, some to varieties of common lilac are "around. I checked two very good references on woody shrubs - trying to understand why a foolhardy shrub like the common lilac would be so fickle in blooming.
One reference acknowledges the many pests that bother lilac, but no pest does so seriously enough to keep it from growing. Both agreed on one thing that may be in play here: Lilacs do their very best in soil that is close to neutral soil a pH of 7. Sandy soil lacks organic matter - working compost, sphagnum peat moss, ground-up leaves and similar stuff into the soil helps dramatically.
It takes a lot by volume, though to make a difference. Back to the recommendation: Unless the old purple plants have sentimental value, I'd replace them. But before doing anything, amend the soil to make it loamier and have the pH checked. My guess is the pH is okay and that the bloomless nature of the bushes is continual transplant shock, the natural bloom cycle and lack of good soil.
Soil pH is easy to check - kits are sold in garden centers and home centers. If you do replace the bushes, I'd go ahead and work on the soil now and visit any large, locally owned nursery for the best selection.
I doubt you will find much of a selection at places that sell nursery stock as a sideline. Autumn is a great time to plant shrubs and trees because weather and soil conditions are ideal for the plant's roots to recover from the ordeal. In fact, when well washed, the flowers of lilacs are edible. Because lilacs have one of the earliest bloom times, they symbolize spring and renewal. Lilacs also symbolize confidence, which makes them a traditionally popular gift for graduates.
There are many meanings that lilacs have that can best be classified by color. White lilacs symbolize purity and innocence. How to Feed Lilacs. Lilacs are fast-growing shrubs available in hundreds of varieties. All lilac bushes are fast-growing shrubs that add at least 6 to 8 inches of growth per year. Do lilac trees bloom more than once a year? Most do not, but the Bloomerang lilac tree blooms in spring, takes a pause in early summer, then blooms again from summer all the way to the first frost of the year.
To deadhead lilacs, simply snip the dead flower, leaving the stem and leaves in place. Pruning off the spent spring blooms will encourage more new growth and more blooms for that second bloom time. No need for cross pollination. There are several reasons why lilacs won't bloom and many times it is difficult to figure out what the problem really is. Please see this previous posting from AaE on the topic: - Shade : Excess shade is the most likely culprit when lilacs fail to bloom well.
Lilacs bloom best in full sunlight, or at least a half-day of sun. Anything less will mean fewer flowers developing. Sometimes the shade creeps up over the years as nearby shade trees grow taller and fuller.
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