Native Plants
Q. Who is Mr. Smarty Plants?
A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
rate this answer
Thursday - July 30, 2009
From: St. Louis, MO
Region: Midwest
Topic: Pollinators, Compost and Mulch, Herbs/Forbs
Title: Failure of tall garden phlox buds to open in St. Louis MO
Answered by: Barbara Medford
QUESTION:
Why won't the buds of my tall garden phlox open? Plants are apparently healthy, no powdery mildew or visible insects, foliage looks great and buds are profuse but they don't open. I have two clumps in different areas, both get full sun. I gave one clump a high phosphorous bloom booster fertilizer but it didn't help. The bees love the closed buds all the same. This happened last year too.ANSWER:
Tall Garden Phlox are hybrids of Phlox paniculata (fall phlox), which is native to Missouri. However, hybridized plants can present a problem, as you don't know exactly what their parentage is, and what attributes of the original plant were edited out and what others were added in to gain more height, different colors, longer blooming time, etc. We found an excellent website, Tall Garden Phlox for Minnesota Gardens, from University of Minnosota Extension. We realize you are not in Minnesota, but the principles should apply. Please read the whole article but some of the things you should probably give attention to are:
The amount of sun (you already said you had full sun).
The soil being well-drained yet retaining adequate moisture; this may require incorporating a generous amount of organic material (compost, etc.) before planting. Plant grows best when it's moist.
Good air circulation to prevent mold, and watering soil, not sprinkling from above, for same reason.
Light application of balanced fertilizer as new growth emerges each Spring, again just before plants begin to flower. Not too much nitrogen, and don't use lawn fertilizer, which is high nitrogen. The high nitrogen encourages leaf development (as in grass) at the expense of flowering.
More Compost and Mulch Questions
Lawn Maintenance in Colorado
March 20, 2010 - When do I begin to fertilize and water my grass in Colorado Springs? I am selling my house and want my lawn to look green?
view the full question and answer
Berms to hold water around roots
December 05, 2008 - I planted new flower beds this November. There are currently dirt 'berms' around each plant - creating a well for water to seep into the immediate plant area. How can I keep these berms from erodi...
view the full question and answer
Yellow bands around edges of leaves in Whitney TX
July 20, 2009 - How can you tell whether esperanzas are getting too much water or not enough - ours have a small yellow band around the edges of the leaves - crape myrtles - same question
view the full question and answer
Gardening advice for Quebec
April 15, 2011 - I live in Aylmer Quebec
1. I bought some lily bulbs at a Christmas bazaar. When can I plant them and what do I put in the hole with the bulbs?
2. I bought a little potted cedar at COSTCO for a Ch...
view the full question and answer
Converting a Texas backyard to grow Xerophytic native plants
January 09, 2015 - I am planning the conversion of our backyard, about 4000 sq ft of largely St Augustine, into a grassless landscape of hardscaping and native plants. I’ve been an avid gardener of rock garden plants i...
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |