When to Plant Celosia in Saint Petersburg, Florida (33713)

Location

Saint Petersburg, Florida

ZIP Code

33713

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Thursday, December 4, 2025

Transplant Outdoors

Thursday, January 22, 2026

Based on last frost Thursday, January 15, 2026 · Zone 10b

Pro tip: Start Celosia seeds indoors 6 weeks before your last frost date, then transplant outdoors around Thursday, January 22, 2026.

Add to Calendar (.ics)

🌿 Plant Details

Scientific Name Celosia argentea

Days to Maturity 75 days

Mature Height 12-36"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

9" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 10-14 days

Ready to Plant Celosia in Saint Petersburg?

Get your seeds now so they're ready by Thursday, December 4, 2025.

🛒 Buy on Amazon 🌿 True Leaf Market

* Affiliate links — we may earn a small commission at no extra cost to you.

🤝 Good Companions

MarigoldZinniaBasil

🤝

Full Companion Planting Guide for Celosia

See which plants help Celosia thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

* Affiliate links — we may earn a small commission at no extra cost to you.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plume or cockscomb heads to dry fully on the plant until fluffy or papery.

Processing

Rub dried heads gently between hands over a bowl to release tiny seeds. Dry 1 week.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Celosia self-sows readily in warm climates. Seeds are tiny — store in small labeled packets.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 56 plants of Celosia. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Celosia in Saint Petersburg, Florida? +

In Saint Petersburg (Zone 10b), start Celosia seeds indoors around Thursday, December 4, 2025 and transplant outdoors around Thursday, January 22, 2026.

What is the last frost date for Saint Petersburg, Florida? +

The average last spring frost date for Saint Petersburg, Florida (ZIP 33713) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.

How long does Celosia take to grow? +

Celosia typically matures in about 75 days from transplanting. In Saint Petersburg, that means you can expect harvest around Thursday, January 22, 2026 plus 75 days.

Should I start Celosia indoors or direct sow in Florida? +

Celosia should be started indoors 6 weeks before your last frost date. In Saint Petersburg, that means starting around Thursday, December 4, 2025.

📚 More Celosia Planting Guides

🗺️

Celosia in Florida

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10b Celosia Guide

All cities in your zone · Avg dates

→

Other Plants for Saint Petersburg

Blackberry Blueberry Raspberry Strawberry Basil Chamomile Chives Cilantro Dill Lavender Lemon Balm Marjoram Mint Oregano Parsley Rosemary Sage Tarragon Thyme Acorn Squash Artichoke Arugula Asparagus Beefsteak Tomato Beet Bell Pepper Bok Choy Broccoli Brussels Sprout Butternut Squash Cabbage Cantaloupe Carrot Cauliflower Cayenne Pepper Celery Cherry Tomato Chili Pepper Collard Green Common Bean Cucumber Eggplant Endive Fennel Garlic Grape Tomato Green Bean Habanero Pepper Head Lettuce Heirloom Tomato Honeydew Melon Jalapeño Pepper Kale Kohlrabi Leaf Lettuce Leek Lima Bean Mustard Okra Onion Parsnip Pea Poblano Pepper Pole Pea Potato Pumpkin Radicchio Radish Rhubarb Roma Tomato Rutabaga Serrano Pepper Shallot Snap Pea Snow Pea Spaghetti Squash Spinach Squash Sweet Corn Sweet Potato Swiss Chard Tomato Turnip Watermelon Zucchini Sunflower Marigold Zinnia Nasturtium Cosmos Echinacea (Coneflower) Petunia Black-eyed Susan Apple Tree Pear Tree Peach Tree Plum Tree Sweet Cherry Tree Lemon Tree Borage Lemongrass Ginger Stevia Tomatillo Edamame Fava Bean Mâche Mizuna Sorrel Shishito Pepper Banana Pepper Watermelon Radish Napa Cabbage Popcorn Broccoli Raab Catnip Valerian Lemon Verbena Bee Balm Anise Lovage Chervil Summer Savory Dahlia Snapdragon Pansy Sweet Pea Morning Glory Hollyhock Larkspur Bachelor Button Columbine Impatiens Salvia (Annual) Sweet Alyssum Lupine Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Celosia in Zone 10b

Celosia (Celosia argentea) is a popular garden vegetable. In Saint Petersburg, Florida, which is in USDA Hardiness Zone 10b, you should start seeds indoors around Thursday, December 4, 2025.

Your average last frost date is Thursday, January 15, 2026. Plan to transplant your Celosia seedlings outdoors around Thursday, January 22, 2026, about 1 weeks after your last frost date.