En EspaŅol

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.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
5 ratings

Monday - April 21, 2008

From: Atlantic Beach, NY
Region: Northeast
Topic: Soils
Title: Plants for acid soils and coffee grounds for the soil
Answered by: Barbara Medford

QUESTION:

Please tell me what plants & flowers need acid soil and are coffee grains good to make soil acid?

ANSWER:

Once upon a time, people took their used coffee grounds outside to a shady spot and buried them. This encouraged earthworms to show up, because the grounds help to hold moisture in the dirt. Sadly, the people doing this were not doing it for the good earthworms can do for gardens, but for bait! That same principle does hold true, however, when you are preparing potting soil and need some acidity in it. Everybody knows coffee is acidic, and your stomach will remind you of that if you drink too much. So, you recycle the leftover grounds from your morning cuppa into an acid-producing, moisture-holding additive to potting soil. Plants that need an acidic soil to do well are rhododendrons (including azaleas), blueberries and blackberries, hydrangeas and many types of evergreens and conifers. Most other plants, including vegetables and fruits, need a neutral to slightly alkaline soil. Some gardeners who are growing acid-loving plants suggest using the coffee grounds as a side dressing to the plants in the ground.

 

More Soils Questions

Landscaping help for Gilmer, TX
September 01, 2008 - We have just moved to the beautiful hot state of Texas from warm California and we need some help! Our roses are dying, we have a patch about 25ft. by 3ft. that gets the rain run off like a little str...
view the full question and answer

Erosion at edge of driveway in Abilene TX
August 26, 2011 - My lawn suffered a great loss of grass over the winter and the soil at the edge of the driveway is washing away with watering and the occasional rains that we have. I am trying to get the grass to gr...
view the full question and answer

Care of Dionaea muscipula (Venus flytrap)
November 30, 2013 - Does the venus flytrap grow better in nitrogen rich soil or in nitrogen poor soil with a diet of insects? Thank you so much for your time!
view the full question and answer

Privacy screen shrubs for Butler PA
August 09, 2013 - Here is what I want in a bush: native to Western Pa.(Southern Butler County), appropriate for a horse pasture,fast growing, not too aggressive (I will mow around it regularly and can prune occasionall...
view the full question and answer

Soil mixes for green roofs
November 23, 2008 - We are trying to set up a green roof system on our own. What do you suggest for soil? It seems the soils are proprietary and unavailable to individuals.
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center