Bright, clean white is an elegant flower colour for the late summer garden. The 3 brightest whites in my garden right now are Phlox paniculata ‘David’ (garden phlox), Hydrangea paniculata ‘Grandiflora’ (PG Hydrangea), and Impatiens walleriana ‘Fiesta White’ (double impatiens). White flowers look cool and refreshing, like a crisp, white cotton shirt.
Phlox paniculata is a stately perennial for the summer and fall garden. It can form good sized clumps, that stand out in a flower bed. Mine are 1m to 1.3m tall (3ft to 4ft). Despite their height, they don’t need staking, although a fierce storm can test their sturdiness. The large beautiful blooms are long lasting. I cut the flowers as they fade, to keep the plant blooming. They are a classic for the summer garden, and combine well with just about any other perennial around them.
This one is flowering in part-shade. Its partner across the yard is in medium shade and has not started blooming yet. They flower better without too much shade, but tolerate part-shade well.
I used to have different varieties of P. paniculata in a previous garden, and was fortunate not to have much powdery mildew. However if it’s a problem, the variety ‘David’ is especially known for its resistance to powdery mildew.
Hydrangea paniculata ‘Grandiflora’ (PG hydrangea) is another prominent bloomer this month. I compared it to some other hydrangea in another post. The last time I posted about it, the flowers were only partially out. This photo shows how the white panicles are more striking now that they’ve had time to open. It’s an outstanding shrub for part-shade. This PG is on the north side of a fence. I’m very pleased with the number of blooms this shrub has, for being in a mostly shady site. A smaller PG hydrangea, located in deeper shade under a willow tree, is not producing blooms the same way.
Like the Phlox, the large hydrangea blooms are long-lasting. It’s always satisfying when a gorgeous flower blooms for an extended time. In the late fall, the panicles still add interest as they fade to brown. Early next spring I’ll snip off the old flowers.
Here’s a much smaller white bloom. This double flowering impatiens is ‘Fiesta White’. Up close, they sometimes have the faintest, pale pink tinge. These small plants are covered in the pretty blossoms. The flowers give the appearance of miniature rose blooms with a multitude of petals. Impatiens don’t need deadheading to keep them flowering. The old blooms fall off, and a steady supply of new buds replace them.
They are satisfied growing in medium shade, where the soil stays moister. Deep shade cuts into the bloom count.
Impatiens are like an annual in zone 3. They can only be placed outside after the last frosts, and will finish quickly after the first frosts in September or October, but until then they’ll brighten the shade. Yesterday there was a full moon. As I looked out the window late at night, these flowers were visible, twinkling in the moonlight.
Here is apost I wrote before, about some white flowering plants in the spring.
Do you grow any stalwarts like hydrangea or phlox, that you can depend on to put on a good display?