With their vibrant leap efflorescence and stately evergreen plant foliage , rhododendrons make a gorgeous addition to landscape painting . But keeping them expand requires caring properly for these picky shrubs . Knowing when to fertilize rhododendrons is key to fuel the best ontogeny and flowers .
Understanding Rhododendron Fertilizer Needs
While rhododendron choose acidic , nutrient - rich ground , their fertilizer requirements are relatively minimal . Too much fertilizer can harm them . The flora evolved in nutritious mountain soils and often thrive without feed .
However , rhododendron growing in short ground or with atomic number 7 - depleting mulch like fresh wood chips will gain from judicious fertilizer applications The goal is supply a balanced feeding to maintain steady outgrowth .
Choosing the Right Fertilizer
While you could find rhododendron - specific fertilizers , they simply acidify the soil . This is only necessary if the soil pH is not already acidic enough for rhododendrons .
or else , opt for a balanced complete normal . Unlike other plant life rhododendrons need relatively downcast N . Look for a ratio stuffy to 10 - 8 - 6 as an ideal nutrient profile .
you’re able to employ either farinaceous or fluid fertilizer . Granules are more economical and ply longer - term feeding . liquid work faster but do n’t persist . Slow - release mealy fertiliser is a good compromise .
Fertilizing in Early Spring After Flowering
The optimal time for feeding rhododendrons is correct after the spring blossoming period ends . This earmark the plant to replenish resource used for flower . It also fuels summertime outgrowth and preparedness for next year ’s peak .
In former spring , give a balanced 10 - 8 - 6 fertilizer when flowers start fading . Scatter granules around the drip course and body of water in well . expend 1 tablespoonful per foot of shrub superlative as a rule of thumb .
you’re able to also do a 2nd , lite feeding in mid - spring when new leaves emerge . But never fecundate after mid - July , as growing should slow for winter dormancy .
Supplementing with Organic Fertilizers
While rhododendron are n’t heavy feeders , you’re able to provide subsidiary organic fertilizers for added food . These fall in down slowly over multiple season .
Well - rotted compost or manure make an excellent soil conditioner and mild plant food . Spread 1 to 2 column inch around the root in drop and scratch gently into the top few inch of soil .
For quicker nutrition , mix a imperfect liquid fertilizer like fish emulsion or compost tea leaf . enforce this twice during the spring and early summer growing season .
Tips for Optimizing Rhododendron Health
Along with right fertilizing , here are some cardinal tip for keeping rhododendron thriving :
flora in rich , acidulous , well - draining territory . Amend if need .
Mulch around the fundament to maintain soil wet and temperature .
Prune mightily after blossom so you do n’t bump off next year ’s blossom buds .
Water deeply when dirt dry out 1 - 2 inches down . Do n’t let solution stay ironic .
Protect from abrasive sun and drying winds . Morning sunshine is ideal .
supervise for coarse cuss like root weevil , lacing bug , and exfoliation louse .
Signs Your Rhododendrons Need More Fertilizer
How can you tell if your rhododendrons are lagging in nutrients ? Watch for these clues :
Declining flower production each yr
Smaller leaves and thinner fresh ontogeny
Yellowing folio
lustreless foliage color
Increased susceptibility to pests and diseases
Dieback of branches
Stunted growth
If you notice any of these issues , examine supplement with an former spring alimentation next year . But rule out other factors like unlawful sunlight , too much wet , constrict root , or plague first .
The Impact of Over-Fertilizing Rhododendrons
While rhododendrons rarely need unreasonable alimentation , it is possible to exaggerate it . Using quick - dismissal fertiliser at with child rates can glow origin and leaf . An overabundance of nutrients can also spur faint , susceptible growth .
Signs of over - fertilization in rhododendrons let in :
brownish leaf backsheesh and margins that may progress to full leaf brown
Drooping , wilted leave
Smaller leaves and thin root
overweening leggy ontogeny
Damage to root and lower branches
Increased exposure to environmental accent and disease
To remedy over - dressing , strip the grease soundly by lacrimation until it runs from the drainage holes . Avoid further feeding for at least a year while supervise recuperation .
Fertilize in Moderation for Happy, Healthy Rhododendrons
The takeout ? Rhododendrons loosely require minimal fertilizer . When in uncertainty , err on the side of less . Aim for a light balanced feeding in early fountain every year or two . add on on occasion with organic accession if hope .
This measured coming will allow for enough nutrition for vibrant blooms and strong increment without overdoing it . compensate close tending to your plant and adapt your eating practices based on their needs in your specific dirt and climate . With a careful fertilizing strategy , your rhododendron will fly high for years to add up .
How Do I Fertilize Rhododendrons? : More Gardening Advice
FAQ
What is the best fertilizer for rhododendron ?
How do you keep rhododendron blooming all summer ?
Are coffee grounds near fertilizer for rhododendron ?
Can you give Miracle Grow to rhododendrons ?
When should you fertilize rhododendron ?
Fertilizing rhododendron requires specific timing and careful techniques . other spring is ideal for applications programme , assure alimental absorption as the growing season start . It ’s crucial to fertilize rhododendron at the correct time to further healthy growth . I always get in early spring , just as new growth begins .
Do azalea & rhododendrons want fertilizers ?
You may point out some fertilizers in the garden store specifically for azalea and rhododendrons . These specialty fertilizers are formulated with ammonium ion sulphate to acetify the soil at the same time as provide N . If your soil is naturally acid , no pauperization to buy these expensive specialty products to feed your rhodies .
How much fertiliser do rhododendron need ?
You ’ll desire to apply a particular fertilizer composition for the dissimilar stages of your rhododendron growth . At planting meter , practice 10 - 10 - 6 fertiliser before you water the industrial plant in . In early spring , the rhododendron buds swell . At this fourth dimension , enforce a complete 10 - 8 - 6 fertilizer . Apply another light dose of this fertilizer when the leaves emerge .
How do you wish for a rhododendron ?
Avoid lime or Ca - rich amendments like limestone , which can raise grime pH. Rhododendrons require consistent moisture but do n’t like soggy roots . Overwatering can be as damaging as underwatering . Water deeply once a week during dry periods , making trusted the ascendent zone is moist but not waterlogged . Use constituent mulch to hold back wet .
