gardenoma

happy planting.

Garden-pedia

Plant terms can be confusing. If you find yourself a bit perplexed, the glossary below may help. If I have missed any, please let me know.

Happy Planting!


Acidic Soil Soil with a pH of less than 7
   
Alkaline Soil Soil with a pH of greater than 7
   
Amendment Any material, such as compost or lime, that is mixed with existing soil to improve properties
   
Annual Plant that completes its lifecycle in one growing season, then dies
   
Basal Foliage Leaves found near the base of the stem
   
Biennial Plant that completes its lifecylce in two growing seasons, then dies
   
Border A garden, usually containing a variety of plants, that is backed by walls, fences, or taller plants, such as, trees or shrubs
   
Compost Organic material used as a soil amendment
   
Crown Area on a plant where the stem meets the root, generally found at soil level
   
Cultivar Refers to a group of plants within a species that has slightly different characteristics, such as, flower color or size
   
Deadheading Removal of old, spent/dead flowers, may promote reblooming
   
Deciduous Refers to trees and shrubs that lose their leaves seasonally, usually in the fall
   
Division The process of splitting up plants, commonly performed on perennials
   
en masse Planting masses of the same plant to create a bold statement
   
Evergreen Plants that retain their foliage for more than one growing season
   
Fertilizer Organic or inorganic material added to the soil to encourage plant growth
   
Groundcover A plant that spreads to cover the soil surface
   
Growth Rate Slow: 3-6" per year, Moderate: 6-12" per year, Fast: 12-24+ per year
   
Habit General form or shape of a plant
   
Hardiness Zone Zones that provide guidelines to measure a plants ability to tolerate hot and cold temperatures
   
Herbaceous Non-woody plant that dies back to the ground every year
   
Invasive Plant A plant that spreads rapidly and may take over a garden bed
   
Loam Soil that is a mixture of clay, sand and silt
   
Mass Planting A planting where large numbers of the same plant are used to provide visual interest
   
Native Plant A plant that naturally occurs in a certain area
   
Node (leaf node) a joint on a plant stem
   
Perennial Plant that survives for 3 or more growing seasons
   
Pinching A technique used to promote fuller or shorter plants, often resulting in more flower heads
   
Rhizome an underground stem
 

Stamen

pollen producing structure, usually found within the center of the flower
Spathe Leaf like structure that encloses the flower
   
Taproot Main root of a plant, usually growing straight down
   
Variegated A plant whose green foliage is marked with another color, usually white or yellow

connect with gardenoma!

name:

email:

comments:

garden how-to

Rhododendron & Azalea Care

Whether evergreen or deciduous, Rhododendrons and Azaleas, can add much needed color to the shady landscape.  With proper care and plant choice you will be rewarded with a beautiful, blossoming shrub for many years.  

Plant Selection

There are many rhododendrons, with different degrees of hardiness.  Always choose a rhododendron that is recommended for your area.  Check plant tags and consult with your local garden center for recommendations.   

Soil

  • Rhododendrons and Azaleas, in general, prefer an acidic soil with a pH around 5.5. 
  • Make sure the soil is light and well drained.  If you have heavy clay, amend well using compost and course/builders sand.
  • How much compost and sand? First, plan on amending the largest area that is practical for your planting.  Then, using a garden fork, loosen the top 6 inches of soil.  Layer that area with 3-4 inches of compost and 3-4 inches of sand, mix well.     

Planting

  • Rhododendrons are available in either B&B (ball and burlap) or container grown.
  • In colder areas, early spring planting is recommended.
  • Any tree or shrub can easily be damaged or killed by planting too deeply.  The top of the root ball should be at the surface of the ground or an inch or two above.  Never plant deeper than they were grown in the nursery.
  • Container grown plants: Water thoroughly before transplanting.  Remove the plant from the container by turning the plant upside down.  If you have difficulty removing the plant from the pot, simply cut off the container.  If the roots have become overgrown and the root mass is in a tight circle, you must loosen those roots prior to planting.  Use your hands to gently tease out the roots.  If that is not possible, use a knife to cut the roots on two to four sides of the pot, starting at the bottom and going no more than half way up the sides of the rootball.  Also, cut across the bottom in an X, than loosen the roots as best you can with your hands or trowel.  Do not be afraid of damaging the plant, they are tougher than you think.  
  • B&B: Do not remove the burlap from the root ball.  After you have placed the root ball in the hole, remove any rope/string that is tied around the trunk and untie the burlap at the top and stuff in the hole.  The burlap will break down in about 6 months.       
  • Always pick up a plant by its root ball, never by its trunk or stem.
  • Dig a hole 2-3 times the width of the root ball and the same depth of the root ball. Save the soil you removed from the hole.
  • Place the root ball in the center of the hole and backfill with the soil you just removed from your newly dug hole.   
  • Water well to help settle the soil around the roots.

After Plant Care

  • Rhododendrons are shallow rooted and the roots may dry out during the summer, so, water well during the summer, especially the first year after planting when the roots have not yet gotten out of the original root ball and into the surrounding soil.  The general rule of thumb is to make sure the plant gets 1 inch of water per week (approx. 10 gal.) either from rain, watering, or a combination of the two.  
  • Mulch to conserve moisture. 
  • Because of their shallow roots, little or no soil work should be done around the base of Rhododendrons. 

Fertilizing

  • Rhododendrons/Azaleas prefer an acid environment. Feed them using a quality slow release acid fertilizer. Apply fertilizer in early spring (March in more northern climates) and again in early summer (June).  Do not feed again for the remainder of the growing season as fertilizer can stimulate growth, which may not harden off prior to early frosts, damaging new stems and leaves.    

 Pruning and Dead-Heading

  • Normally very little pruning is needed.  If you wish to maintain a specific size, remove no more than 1/3 of the plant per year. Pruning and dead-heading (removal of old flower heads) should be done immediately after blooming in order to avoid affecting the following year’s flowers.
Happy Planting!