Here is the UnMD Fact Sheet in Growing Corn in the Home Garden

Growing Sweet Corn in a Home Garden | University of Maryland Extension

I have never grown corn myself, but did an AI search for growing corn in Maryland and found (and reviewed) the following:

For a 40' × 50' home garden in Maryland (Zone 7 / Mid-Atlantic), you’ve got enough space to grow excellent sweet corn—but the “best” variety depends on a few key factors:

• Heat tolerance & disease resistance (important for humid Maryland summers)
• Days to maturity (to avoid late-season pests like earworms)
• Sugar type (flavor vs. storage life)
• Planting in blocks (you’ll have plenty of room for proper pollination)

How to use your 40' × 50' plot effectively

Stick to one corn type per block

• Don’t mix supersweet (sh2) with standard types—they cross-pollinate and reduce quality
• Best single choice: ‘Providence’ (modern, reliable, excellent eating)
• Best classic flavor: ‘Silver Queen’
• Best ultra-sweet: ‘Nirvana’
• Best strategy: plant 2–3 varieties with different maturity dates

Block 1 (front): Early harvest

• Early Sunglow’
• Plant first when soil hits ~60°F 
• (late April–early May in Maryland)

• Plant 10–14 days after early block

Block 3 (back): Late crop

• ‘Silver Queen’ or ‘Nirvana’
• Plant another 10–14 days later

1. Fertilizer (critical for corn)

• At planting: balanced fertilizer (like 10-10-10)
• When plants are knee-high: side-dress with nitrogen

2. Water

• Needs ~1–1.5 inches/week
• Most important during:
• Tasseling
• Ear formation

3. Pest timing trick (very important)

• Avoid peak corn earworm pressure (July–August)
• Early block often escapes worst damage

4. Pollination boost
When tassels appear:

• Gently shake stalks in the morning
• Helps fill out ears fully

If you prefer easier management:

Plant just one variety (Providence)

Do 3 smaller plantings, 10 days apart

I hope the above info is not too confusing. Read the labels on the seed envelopes to get more info and maybe go to a seed store where the staff have direct experience with growing corn in this area and ask them.

Good luck
Len