This guide highlights flowers that are sensitive to high temperatures and thrive in cooler conditions. These blooms are ideal for spring, fall, or indoor arrangements in air-conditioned spaces. Understanding their needs helps florists and customers maintain their beauty and longevity.

1. Tulips

• Description: Tulips are elegant, cup-shaped flowers available in vibrant colors like red, yellow, pink, and white. They bloom in spring and are a favorite for bouquets and centerpieces.
• Heat Sensitivity: Tulips wilt quickly in temperatures above 70°F (21°C). Their petals become soft and droopy in heat.
• Care Tips:
  • Store in a cool place (35–45°F or 2–7°C) before arranging.
  • Keep in fresh, cool water with flower food.
  • Avoid direct sunlight or warm drafts.
• Best Use: Spring weddings, indoor arrangements, or shaded outdoor displays.

2. Hydrangeas

• Description: Hydrangeas feature large, lush clusters of blooms in shades of blue, pink, white, or green. They add volume to arrangements.
• Heat Sensitivity: Hydrangeas dehydrate rapidly in heat above 75°F (24°C), causing wilting petals and browning edges.
• Care Tips:
  • Submerge flower heads in cool water for 10–15 minutes to rehydrate.
  • Mist petals lightly to maintain moisture.
  • Place in a refrigerated display if possible.
• Best Use: Indoor events, shaded garden settings, or cooler climates.

3. Lilacs

• Description: Lilacs are fragrant, cone-shaped clusters of tiny flowers in purple, white, or pink. They evoke a romantic, vintage charm.
• Heat Sensitivity: Lilacs fade and wilt in temperatures above 70°F (21°C), losing their fragrance and vibrancy.
• Care Tips:
  • Cut stems at an angle and split woody ends for better water uptake.
  • Keep in a cool, well-ventilated area.
  • Change water daily to prevent bacterial growth.
• Best Use: Spring bouquets, indoor decor, or evening events.

4. Peonies

• Description: Peonies are lush, full blooms with soft petals in pink, white, coral, or red. They’re a staple for romantic arrangements.
• Heat Sensitivity: Peonies droop and shed petals in heat above 75°F (24°C), especially when fully open.
• Care Tips:
  • Store in a cooler at 34–38°F (1–3°C) until use.
  • Use a supportive vase to prevent stem bending.
  • Keep away from heat sources like radiators or sunny windows.
• Best Use: Wedding bouquets, indoor centerpieces, or cool-season events.

5. Sweet Peas

• Description: Sweet peas are delicate, ruffled flowers with a sweet fragrance, available in pastel shades like lavender, pink, and white.
• Heat Sensitivity: Sweet peas wilt and lose color in temperatures above 65°F (18°C), making them unsuitable for hot climates.
• Care Tips:
  • Harvest early in the morning when temperatures are cooler.
  • Keep in shallow, cool water to avoid stem rot.
  • Display in shaded or air-conditioned spaces.
• Best Use: Garden-inspired arrangements, boutonnieres, or spring displays.

General Care Tips for Non-Heat-Resistant Flowers

• Storage: Store flowers in a floral cooler at 34–40°F (1–4°C) with high humidity (80–90%).
• Hydration: Use clean vases and change water every 1–2 days. Add floral preservative to extend life.
• Placement: Avoid placing arrangements near heat sources, direct sunlight, or fruit bowls (which release ethylene gas, accelerating wilting).
• Transport: Use insulated coolers with ice packs for delivery in warm weather.

When to Use These Flowers

These flowers are best suited for:

• Cool Seasons: Spring or fall when temperatures are moderate.
• Indoor Events: Weddings, parties, or corporate events in air-conditioned venues.
• Shaded Outdoor Settings: Gardens or patios with ample shade and cool breezes.

By selecting these flowers for appropriate settings and following proper care protocols, florists can ensure stunning, long-lasting arrangements that delight customers.