Flowers to Sow in April 3-6 weeks before average last frost

This is my list of flowers to get started in April. Some of these will get direct sown before my last frost and some will be started indoors. There are some flowers on this list that can be left to direct sow after or around last frost, but I prefer to start some earlier because of my short gardening season.

If you want to see when I am starting my other flower seeds check out these videos February: https://youtu.be/AWDjSHRY91Q
March: https://youtu.be/KXtKM60QF6Y

Products I use:
Seed Storage
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Monois Grow Lights
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Barrina Grow Lights
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10 Pack Seed Starter Kit (12 cells each)
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Chapters in this video
00:00 Introduction
00:30 Marigolds
02:36 Gomphrena
03:39 Asters
04:51 Zinnias
08:50 Strawflower
09:51 Cleome
10:29 Rudbeckia
12:36 Gaillardia
13:21 Amaranth
14:52 Phacelia
15:47 Calendula
16:29 Candytuft & Alyssum
17:31 Nigella
18:30 Nemophilla
19:11 Cosmos
20:52 Poppies
22:49 African Daisy
23:36 Spanish Flag
24:13 Sweet Peas
24:53 Gladiolus
25:14 Nasturtiums
25:52 Bachelor’s Buttons
26:59 Conclusion