Marigolds are easy to grow from seed but I’ve generally had issues with them becoming root bound or drying out. Once they dry out the plants suffer. The key – use larger pots and start later than you think.

This is my personal garden growing guide. I use it to track seed sources, when to start seeds and if I should adjust growing conditions in my own greenhouse and garden. Please don’t consider this professional grower’s advice.

FAVOURITE VARIETIES AND SOURCES

I grow marigolds primarily to add to the vegetable garden. I prefer shorter, french varieties for this. I’ve tried a few varieties but have settled on Hero Mix.

Veseys

• Super Hero Mix

Seed Starting Guide

Our last frost date is around May 13 according to the almanac however it’s rare for us not to have a cold snap before the May 24 weekend. My updated 2026 schedule is as follows:

Start Date

• April 12–15 (5–6 weeks before May 24)
• Germination temp: 21–24°C
• Days to germination: 4-7 days

Sowing Method

• Sow directly in cell packs (or my preferred Boot Strap Farmer 3″ pots)
• Prone to damping off so keep temperature higher and use vermiculite
• Cover lightly about 1/4 inch soil – use vermiculite to control damping off
• No potting up required

Growing On

• Temp: 18-20°C
• Light: 14–16 hours
• Pinch growing tips to encourage branching
• Water from below
• Fertilize when 3 to 4 weeks old.

Planting Out

• Frost tender
• Plant after May 24