When to Plant Bachelor Button in Milpitas, California (95036)

Location

Milpitas, California

ZIP Code

95036

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Sunday, January 11, 2026

Based on last frost Sunday, January 25, 2026 · Zone 10a

Pro tip: Sow Bachelor Button directly outdoors 2 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Centaurea cyanus

Days to Maturity 60 days

Mature Height 12-30"

Spread 9"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Low to Moderate

↔️

Spacing

9" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Bachelor Button in Milpitas?

Get your seeds now so they're ready by Sunday, January 11, 2026.

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🤝 Good Companions

TomatoBeanVegetable Garden

🤝

Full Companion Planting Guide for Bachelor Button

See which plants help Bachelor Button 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 flower heads to dry completely on the plant. Harvest when fluffy seed heads are fully dry.

Processing

Pull seeds from dried flower heads — seeds have a small feathery tail. Dry 1 week in open envelope.

Seed Viability

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

Pro Tip

Bachelor buttons cross freely — expect some color variation when growing multiple colors and saving seed.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Bachelor Button in Milpitas, California? +

In Milpitas (Zone 10a), direct sow Bachelor Button outdoors around Sunday, January 11, 2026.

What is the last frost date for Milpitas, California? +

The average last spring frost date for Milpitas, California (ZIP 95036) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.

How long does Bachelor Button take to grow? +

Bachelor Button typically matures in about 60 days from direct sowing. In Milpitas, that means you can expect harvest around Sunday, January 11, 2026 plus 60 days.

Should I start Bachelor Button indoors or direct sow in California? +

Bachelor Button does best when direct sown outdoors. In Milpitas, sow directly around Sunday, January 11, 2026.

📚 More Bachelor Button Planting Guides

🗺️

Bachelor Button in California

Zone-by-zone breakdown · Full state guide

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Zone 10a Bachelor Button Guide

All cities in your zone · Avg dates

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Growing Bachelor Button in Zone 10a

Bachelor Button (Centaurea cyanus) is a popular garden vegetable. In Milpitas, California, which is in USDA Hardiness Zone 10a, you should direct sow seeds around Sunday, January 11, 2026.

Your average last frost date is Sunday, January 25, 2026. Bachelor Button grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.