How To Care For Palm Trees
Palm Tree Trimming
When it comes to care for palms, the overall health of your palm tree starts with proper pruning. Trimming should be done during the growing season (Spring – Summer) and is not recommended in winter. When trimming fronds from your palm tree, only remove dead (brown), dying, or diseased (spotted) fronds. Make the cuts as close to the trunk as possible without damaging the trunk, and cut at a slight angle to allow for water runoff. It’s also beneficial to remove seed pods and flowers as they appear throughout the year, which will direct the tree’s energy towards growth and reduce debris. After trimming, be sure to clear away and dispose of all debris from the base of the tree to prevent pests and diseases.
Why is it recommend to wait until Palm fronds have turned brown to trim them?
Removing palm fronds before they’re brown or dead can deprive the tree of nutrients. Palms accumulate nutrients in their fronds, and will draw from older fronds to support new growth.
Palm Tree Nutrition
If palm fronds naturally yellow, how do you know if there are nutrient deficiencies?
Nutrient deficiencies are bound to happen in our sandy soil of the Gulf Coast, as nutrients percolate from the soil very quickly, especially after heavy inundations of rain. The best way to prevent these issues is to have a regular fertilizer schedule for your palms. It is recommended to fertilize with a Palm specific fertilizer (that contains micronutrients such as magnesium) up to 4 times per year (quarterly). Keep in mind that fertilizer will not fix the leaves that are damaged as the nutrients will benefit the new growth. A proper fertilizer regiment is key for the overall care of palm trees in your landscape.
Common Nutrient Deficiencies in Florida Palms
Naturally palms will yellow from the stem out to the edge of the palm fronds first. Yellowing that starts from the edges first, black spotting, necrotic spotting, and browning in the center midribs can also be signs of nutrient deficiencies.
Magnesium (Mg) Deficiency:
- Typically, most severe on older leaves (bottom fronds)
- Marginal chlorosis (yellowing) on the edges of the leaves of the fronds where the middle (midrib) remains green
- Typically affects the older leaves and the tips of the leaves
- Look for translucent yellowing or necrotic (black) spotting and marginal tip death. If you hold the palm fronds toward the sun and you can see through them, this could be a sign of a Potassium deficiency.
Manganese (Mn) Deficiency:
- Affects the newer leaves and fronds first.
- Intravenous yellow and black streaking
- Withering or frizzling of leaflets on newer growth
- If severe, apical stem death is a concern
Boron (B) Deficiency:
- Affects newer leaves and fronds. New leaves wont open correctly and abortion of flowers and fruits before they form is common.
- Accordion (folding) of new growth
- Horizontal growth from the apical meristem
- Death of the apical meristem is a concern if severe.
By understanding and addressing these common nutrient deficiencies, you can ensure optimal care for palms in your garden. Proper pruning, fertilizing, and monitoring for deficiencies are all crucial steps in maintaining healthy and vibrant palm trees.
Pests & Disease On Palms To Watch Out For In Northwestern Florida
- Palm Weevil
- Large weevil, native to Florida that can damage and potentially kill palm trees. Preventative measures can be taken with the use of approved insecticidal treatments; however, it is best to remove and destroy of severely infected palms.
- Asian Cycad Scale
- While this scale does not target true palm trees, it is a very common issues on Cycads (Sagos Palms, etc) in Northwestern Florida. They are small fuzzy white insect that will make the leaves appear to be dusted in snow when severely infected. Asian Cycad Scale also affects the root system. Mechanical control includes removal and disposal of affected fronds. Approved systemic insecticides are also needs for treatment and control
- Fusarium Wilts
- A lethal fungal disease; Leaves/Fronds will look yellow and wilt. If you believe your Palm is infected, contact your local Extension Agent
- Phytoplasma Diseases – Lethal Yellowing (LY) & Lethal Bronzing (LB)
- This is an incredibly problematic disease that has plagued southern Florida, parts of Texas and Louisiana. The State of Florida has worked very hard to isolate this disease to specific counties in South and Central Florida, and as of yet, has not be recorded to be found in Northern or Northwestern Florida, but it is important to note and be mindful of. If you believe your palm may be affected, please contact your local Extension Agent.