This guide answers when to plant catnip zone 7 with timing worked out from USDA Zone 7 frost-date averages, not guesswork. Catnip is the mint-family herb that sends cats into bliss, and it also makes a mild, calming tea for people. In Zone 7 it is a hardy perennial that comes back year after year with almost no care — the main challenge is not growing it, but keeping it from taking over the bed and keeping the neighbourhood cats from rolling on it.
This guide covers when to plant catnip zone 7, how to start it, what soil and spacing it needs, and how to harvest and dry the leaves for cats and tea.
Zone 7 at a glance
Zone 7 covers areas where average annual minimum temperatures run 0 to 10°F. The average last spring frost falls in the Mar 15–Apr 1 range and the average first autumn frost in the Nov 1–15 range — these are USDA zone averages, not exact dates for any one garden, so check your local extension service before planting tender crops outside. Use the frost date calculator to work out dates for your own garden, and browse the planting calendar hub for the full Zone 7 year.
When to plant catnip in Zone 7
| Step | Timing in Zone 7 |
|---|---|
| Start indoors | February to March, or direct sow in spring |
| Direct sow outdoors | March to April, about 2 to 4 weeks before the last frost |
| Transplant outdoors | April, once seedlings are sturdy |
| Divide established plants | March to April, every few years in spring |
| Harvest | June to September, cutting stems before flowering |
The table above is the short answer. Catnip is hardy, so sow it early. Start indoors in February to March, or direct sow in March to April, about 2 to 4 weeks before the average last frost range of Mar 15–Apr 1. Established plants regrow on their own in spring, and spring division in March to April is an easy way to get new plants. The picking season runs until the first frost in the Nov 1–15 range, but the roots survive winter and the plant returns the following spring. The Zone 7 March guide shows what else is happening in the garden in that month.
How to plant catnip
Sow seed indoors in February to March, or direct sow in March to April, scattering seed on the surface and pressing it in lightly — it needs light to germinate. Germination takes 7–14 days. Set plants out in April, spacing them 12–18 inches apart, and harden seedlings off for a week before they go outside. Catnip spreads by seed and by root, so many gardeners grow it in a pot sunk into the ground, or in its own corner where it can roam without swallowing its neighbours.
Give catnip full sun — at least six hours of direct sun a day for full-sun crops, or morning sun with afternoon shade where part shade is listed. Prepare the bed by forking in compost and removing stones and weeds, and check the soil pH: catnip prefers 6.0–7.0. Space plants 12–18 inches apart — the spacing in the table below — and sow seed at the depth on the packet, keeping the seedbed moist until germination, which takes 7–14 days.
| Fact | Range |
|---|---|
| Sun | full sun |
| Days to germination | 7–14 |
| Days to maturity | 70–90 |
| Spacing | 12–18 inches |
| Soil pH | 6.0–7.0 |
| Sowing method | both |
| Cold tolerance | hardy |
| Water needs | low |
Watering and feeding
Catnip has low water needs: keep the soil moist until plants are established, then water only in dry spells. It is drought-tolerant once it has grown its roots, and overwatering causes more problems than dry soil. Water at the base in the morning so leaves dry before night. A light mulch helps hold moisture without keeping the crown wet.
Companion plants and rotation
Good companions for catnip include tomatoes, peppers, marigolds, cabbage. Its strong scent is said to repel some pests, including aphids and squash bugs, so it earns its place near vegetables. Use the companion planting finder to plan combinations for your whole bed, and give catnip room: it spreads, so do not plant it tight against slow-growing neighbours. Also see our guide to when to plant mint in Zone 7, its close mint-family relative, which needs the same kind of containment.
Use the herb drying calculator to plan combinations for your whole bed.
Pests and problems
The common pests for catnip are aphids, spider mites, whiteflies. Its real pest is cats: they roll on young plants and can flatten them, so protect new plants with a wire cloche or a ring of sticks until they are established. Aphids may cluster on tips and can be washed off with water. Good air flow helps — do not crowd plants — and clearing away dead leaves and debris removes places where pests hide. Check plants weekly, looking under leaves as well as on top, and clear away dead leaves and debris where pests hide.
Harvesting and storing
Pick stems from June to September, about 70–90 days after sowing, cutting them in the morning before the plant flowers, when the leaves are at their most potent. Use leaves fresh, or dry whole stems in small bunches in a shady, airy place and strip the leaves into a sealed jar once they are crisp; dried catnip keeps for months. For cats, offer a pinch of dried leaf or a stuffed toy filled with it. Cut plants back after flowering and they will often push out a fresh flush of leaves before autumn.
Frequently asked questions
When should I plant catnip in Zone 7?
Direct sow in March to April, about 2 to 4 weeks before the last frost, or start indoors in February to March. Work back from the average last frost range of Mar 15–Apr 1. These are zone averages, so check your local extension service for your area.
Will catnip take over my garden?
It can spread by seed and root, so give it its own space or grow it in a pot. Deadhead flowers before they set seed if you want to limit self-sowing, and pull out stray seedlings while they are small.
How long does catnip take to grow?
About 70–90 days to maturity from sowing or transplanting, depending on variety and weather. Germination takes 7–14 days. Warm, sunny weather speeds growth; cold or cloudy weather slows it, so treat these as ranges, not exact dates.
What soil pH does catnip need?
A pH of 6.0–7.0 is ideal. Test your soil before planting and amend it if needed — your local extension service can test a sample and advise on what to add.