Monthly Archives: December 2023

Ensuring the Survival of Sensitive Plants in Northeast Florida’s Cooler Climates

Ensuring the Survival of Sensitive Plants in Northeast Florida’s Cooler Climates

Northeast Florida, with its unique climatic conditions, presents distinct challenges for gardeners, particularly when it comes to the cultivation of sensitive tropical plants, palms, and citrus varieties. As temperatures dip in the cooler months, understanding and managing the cold tolerance of these plants is crucial for maintaining a vibrant and thriving garden. This comprehensive guide aims to assist gardeners in the Jacksonville, Florida area in safeguarding their sensitive plants from the threats of colder weather.

Understanding Plant Hardiness Zones

 

 

A fundamental aspect of gardening in Northeast Florida, particularly in areas like Jacksonville, is understanding the USDA Hardiness Zone of the region. Classified as Zone 9a, this area experiences temperatures that can drop to 20-25°F. Selecting plants that can endure these minimum temperatures is vital to prevent cold damage.

Zone Map

Tropical Plants and Their Cold Sensitivity

Many tropical plants enhance Northeast Florida landscapes, but their sensitivity to cold necessitates extra care during the winter. Important tropical species include:

Hibiscus

Hibiscus

These plants are celebrated for their large, vibrant blooms but are susceptible to frost damage. Cover lightly in a mild frost. Double up your frost cloth in a hard freeze.

Shell Ginger

Shell Ginger

Tropical ginger varieties require protection from the cold to preserve their lush foliage. Shell ginger can freeze back and come back from the gound. Cover if you would like to keep it from dying all the wayback.

Hawaiian Ti

Hawaiian Ti

Cherished for their colorful leaves, they struggle in cooler temperatures. They can come back from the ground after a freeze but protecting them will help minimize the damage to the leaves.

Xanadu Philodendron

Xanadu Philodendron

This dwarf variety of philodendron needs shelter from freezing conditions.

Croton

Croton

Known for their striking multi-colored leaves, crotons are truly tropical. They are sensitive to cold drafts and can take damage under 40 degrees. It is best if you can bring them indoor.

Stromanthe

Stromanthe

Prized for their attractive leaves, stromanthe plants definietly require frost protection.

Cold Sensitive Palms

  Palms, a Florida landscape staple, vary in their cold tolerance. These palm varieties will sustain damage and or death in a hard freeze.  They will fair better the longer they have to get established. Other factors my include position in your yard and yard’s individual micro climate, the severity of the freeze and it’s duration.

Some palm species requiring special attention in cooler weather are:

 

Roebelleni (Pygmy Date Palm)

Roebelleni (Pygmy Date Palm)

Adonidia (Christmas Palm)

Adonidia (Christmas Palm)

Raphis (Lady Palm)

Raphis (Lady Palm)

Bismarckia

Bismarckia

Foxtail

Foxtail

Citrus Trees and Frost Protection

In Northeast Florida, gardeners are fortunate to be able to cultivate a variety of citrus trees that bring both beauty and bountiful harvests to their landscapes. Despite the region’s mild climate, occasional cold snaps do occur, and understanding how to protect these trees is essential. Here’s a tailored guide for commonly planted citrus in this region:

  • Meyer Lemon Trees: These trees are robust against cold, managing to survive in temperatures as chilly as 20°F. They can also endure brief dips to 32°F. For regions where the mercury drops below 20°F, consider potting these trees and moving them indoors to escape the cold.
  • Persian Lime Trees: Among the lime varieties, Persian limes show the greatest resistance to cold, withstanding short periods at 21-22°F. Extended exposure to teen temperatures for over half a day could be fatal. They are suitable for open planting in USDA Zones 9-11.
lime (Citrus x latifolia) tree
Ornge Tree citrus
  • Valencia Orange Trees: Short spells of cold down to 30°F won’t harm these trees, but prolonged cold can affect the fruit’s quality and deplete its vitamin C levels.
  • Ruby Red Grapefruit Trees: These trees have a tolerance for cold in the range of 15–20°F, yet they are sensitive to frost, which is particularly damaging to the fruit. Optimal growth is achieved in USDA Zones 9 and 10.
  • Tangerines and Mandarins: These varieties show a degree of cold resilience, capable of withstanding temperatures down to 20°F with minimal impact.
  • Satsuma Mandarins (Trifoliate Rootstocks): Renowned for their cold hardiness, mature Satsuma mandarins grafted onto Trifoliate rootstocks can cope with temperatures as low as 15 or 16°F.

 

    Strategies for Cold Protection

    One of the most effective measures is the use of freeze cloth or frost blankets. These specially designed cloths are draped over plants to insulate them from the cold, while still allowing air and moisture to reach the foliage. Unlike plastic covers, which can trap excessive moisture and lead to fungal diseases, freeze cloths provide a breathable yet protective barrier against frost. It’s important to cover the plants before sunset to retain residual heat and extend the cloth all the way to the ground to trap heat more effectively. Additionally, ensure that the cloth is secured to prevent it from being blown away by the wind. Other steps include watering the plants before a freeze, as moist soil retains heat better than dry soil, and using mulch to insulate the roots. For potted plants, moving them indoors or to a sheltered area can offer significant protection. Implementing these basic yet essential freeze protection steps can greatly enhance the survivability of sensitive plants during cold snaps.

    Additional effective strategies to protect sensitive plants from cold include:

      1. Understanding Chilling Temperatures: Temperatures between 32°F and 59°F can stress tropical plants, leading to wilting, yellowing, and reddish-brown spots.
      2. Location and Exposure: Planting sensitive species away from areas with northern exposure and using hardier plants as windbreaks can provide additional protection.
      3. Acclimation Processes: Plants start acclimating in autumn as daylight hours decrease. Understanding this natural process helps in preparing plants for the cold.
      4. Overwintering and Indoor Propagation: Consider relocating highly sensitive plants indoors or to greenhouses as temperatures drop.
      5. Post-Chill Care: After chill exposure, ensure plants are adequately watered and avoid immediate fertilization to reduce stress.

       

      Consulting with Experts

      For personalized advice, resources like Earth Works of Jacksonville can provide invaluable guidance and solutions for specific lawn, garden, and landscaping needs in the Northeast Florida region.

      Maintaining a lush garden in Northeast Florida’s cooler climate requires an in-depth understanding of the cold tolerance of various plant species. By recognizing the needs of sensitive tropical plants, palms, and citrus trees, and employing effective cold protection strategies, gardeners can ensure the survival and flourishing of their gardens through the chillier months. With proper planning and care, the diverse and vibrant flora of Northeast Florida

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