When to Plant Lupine in Saint Petersburg, Florida (33708)

Location

Saint Petersburg, Florida

ZIP Code

33708

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, December 18, 2025

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

Pro tip: Sow Lupine directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Lupinus polyphyllus

Days to Maturity 365 days

Mature Height 24-48"

Spread 24"

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Moderate (1 inch/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 14-21 days

Ready to Plant Lupine in Saint Petersburg?

Get your seeds now so they're ready by Thursday, December 18, 2025.

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🤝 Good Companions

CarrotBrassicasCorn

⚠️ Avoid Planting Near

Fennel

🤝

Full Companion Planting Guide for Lupine

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

🛠️ Supplies You'll Need

🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow seed pods to dry on the plant — pods will turn black and begin to twist when fully ripe.

Processing

Collect before pods explode and fling seeds. Shell pods, dry seeds 1 week.

Seed Viability

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

Pro Tip

Lupine seeds have a hard coat — nick with sandpaper or soak 24 hours before sowing to improve germination.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 14 plants of Lupine. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

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

In Saint Petersburg (Zone 10b), direct sow Lupine outdoors around Thursday, December 18, 2025.

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

The average last spring frost date for Saint Petersburg, Florida (ZIP 33708) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.

How long does Lupine take to grow? +

Lupine typically matures in about 365 days from direct sowing. In Saint Petersburg, that means you can expect harvest around Thursday, December 18, 2025 plus 365 days.

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

Lupine does best when direct sown outdoors. In Saint Petersburg, sow directly around Thursday, December 18, 2025.

📚 More Lupine Planting Guides

🗺️

Lupine in Florida

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10b Lupine 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 Celosia Verbena Elderberry Grape Vine Red Currant Gooseberry Serviceberry Fig Tree Avocado Tree Persimmon Tree Olive Tree

Growing Lupine in Zone 10b

Lupine (Lupinus polyphyllus) is a popular garden vegetable. In Saint Petersburg, Florida, which is in USDA Hardiness Zone 10b, you should direct sow seeds around Thursday, December 18, 2025.

Your average last frost date is Thursday, January 15, 2026. Lupine grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.