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Mammoth Dill

Mammoth · Apiaceae

Fragrant annual dill grown for feathery leaves and flavorful seed heads. Tall classic pickling dill grown for both aromatic leaves and large seed umbels. Key facts: 45–65 days to maturity, 6+ hours of sun, 8–12 " spacing. Container-friendly (minimum 2-gallon pot).

Updated April 19, 2026 · Backed by 5 cited sources
Overview

At a Glance

The essentials first: timing, light, spacing, seed-starting, container fit, and overall size.

Days to maturity
45–65 days
Sun
6+ hours
Full Sun In Cool Seasons
Spacing
8–12 "
between plants
Seed start
0 weeks
before transplant
Container
Yes
2+ gallon pot
Height
3–5 ft
at maturity
Planting window

Zone Planting Guide

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This card updates instantly with viability, frost timing, and any planting notes for your selected zone.

Care

Growing Guide

Everything in one place: seed starting, transplant timing, watering, soil, and structural support.

Seed starting
Germination
Time7–14 days
Optimal temperature65°F
Seed depth0.25"
Moving outdoors
Transplanting
Minimum soil temp50°F
Harden off0 days
Moisture
Watering
Weekly1–1.5 "
NeedsModerate
Drip or gentle base watering
Root zone
Soil
pH range5.8–7.5
PreferredWell Drained Moderate Fertility Loam
Dill - Mammoth seeds

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When you shop through this link, SoilStack earns a small commission at no extra cost to you. It's how we keep the site free and the calendar ad-free. Every product on this page was hand-selected based on university extension research.

Dill - Mammoth seeds

40-65 days. Annual plant Adds great flavor and color to many culinary creations 3 ft.

Shop on Seeds Now
Resilience

Plant Health

Stress tolerance, resistance notes, and the most common problems to watch for as plants mature.

Tolerance
Heat: Low Cold: Moderate Drought: Low

Common Issues

Bolting

Cause: Heat and long days quickly trigger flowering.

Prevention: Sow early, use successive sowings, and provide some afternoon shade in warm zones.

Aphids

Cause: Tender aromatic growth can attract sap-feeders.

Prevention: Rinse off early and encourage lady beetles and hoverflies.

Leaf Spot

Cause: Crowded humid foliage stays wet too long.

Prevention: Thin properly and water at the base

Feeding & picking

Nutrition & Harvest

How hungry the plant is, what ripe harvest looks like, and how long the crop keeps after picking.

Feeding
Nutrition
Feeding intensityLight feeder
RecipesWorm Castings Topdress, Compost Tea
Timing
Harvest

Leaves are feathery and bright green for fresh use; seed heads turn tan and dry when ready for spice use.

Expected yield0.1–0.3 lbs/plant
Storage5 days — Refrigerate fresh fronds wrapped loosely; dry or freeze leaves and fully dry seeds before storing.
Plant relationships

Companion Planting

Helpful neighbors can support growth or deter pests. Keep antagonistic plants separated to reduce stress and competition.

What you'll need

Growing Supplies

Based on Mammoth Dill's growth profile -- recommendations matched to this variety's specific requirements.

Drip irrigation / soaker hose kit

Every gardener benefits from putting water at the root zone instead of on the leaves, because drip and soaker systems reduce foliar disease pressure by limiting leaf wetness and soil splash. A quality kit should include a backflow preventer, filter, pressure reducer, and UV-resistant tubing.

Source: Iowa State University Extension; Colorado State University Extension; UMass Extension

Soil test kit

A soil test gives a baseline for pH and nutrient status so gardeners can add only what the soil actually needs. Prioritize a mail-in or lab-affiliated kit whenever possible because extension guidance notes that laboratory testing is more accurate than instant readers.

Source: University of Maryland Extension; Purdue Extension; Montana State University Extension

Quality bypass pruners

Extension guidance favors bypass designs because they make cleaner, closer cuts on living tissue than anvil types. Look for hardened steel blades that can be sharpened, a comfortable grip, and a cutting capacity matched to real home-garden stems.

Source: University of New Hampshire Extension; Iowa State University Extension; Purdue University Extension

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Research

Sources

Reference material and extension guidance used to build this growing guide.

seed_catalog Seeds Nowuniversity Penn State Extensionuniversity University of Minnesota Extensionreference Johnny's / common dill production referencesinference Estimated gdd from dill leaf harvest window and cool-season herb growth rates
Internal links

Mammoth Dill Planting Dates by Zone

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