Not every mum you buy in late summer will bloom for you in fall. If you want mums for sale this midsummer to set strong roots and flower on schedule, pick plants labeled early, mid, or late bloomers, choose the right bud stage, plant them with the top of the root ball level with the soil, space 12 to 24 inches apart, and give each plant about 1 gallon at planting then roughly 1 gallon per week while roots establish. Follow your frost dates below.
Choose mums for sale by bloom timing, color, and flower form
People assume any mum will bloom in September and October. That only happens if the plant is the right type and the buds are at the right stage when you buy it. Nurseries sell early, mid and late bloomers. They also sell florist mums that open early and often do not survive winter.
How to read plant tags, identify early mid and late bloomers, and why form matters for garden use
Read the tag closely. Good tags say one of these things, or list an expected bloom week. If the tag says “early” expect blooms about 2 to 3 weeks before your usual peak. “Mid” is peak, and “late” is 1 to 2 weeks after peak.
- Early bloomers, use for front-row color or containers. They open sooner and may finish earlier.
- Mid-season bloomers, the backbone of the border. They form full heads exactly at the garden’s usual display week.
- Late bloomers, best for extending color into late October and early November.
Flower form matters. Choose:
- Pompon and cushion forms for neat borders and massing.
- Quill, spider, and anemone forms for focal points or mixed containers.
- Large decorative forms for a single specimen plant where you want a wow factor.
If the tag lists a cultivar name, take note. Many growers sell hardy garden mums under cultivar names such as the Sheffield series or Noble series. If a tag only says “florist mum” or “greenhouse mum,” assume it will not overwinter in cold climates and treat it as an annual.
| Bloom time | When to plant relative to first frost | Best uses |
|---|---|---|
| Early | Plant 6 to 8 weeks before first frost | Containers, front of bed |
| Mid | Plant 6 to 8 weeks before first frost | Main border display |
| Late | Plant 8 to 10 weeks before first frost to be safe | Extend fall color later |
Inspect mums at the nursery, what to reject and what is acceptable
Take a checklist with you when shopping. I always touch the soil, look under leaves, and ask the grower one question: when will this bloom here? Here is what I inspect and what to leave on the bench.
Check roots in the pot, look for bud stage, common pest signs, and how to spot rootbound or overwatered plants
- Root check, acceptable: roots visible at drainage holes, white and fibrous within the hole, not tightly circling. Reject if roots are a dense, dark mass circling the pot, that is severely rootbound.
- Bud stage, acceptable: many tight green buds or a mix of buds and a few open blooms. Avoid majority open blooms if you want color later, they may be spent by your peak week.
- Overwatered signs, reject: yellowing lower leaves, soft stems, and a sour smell when you lift the pot. These plants often suffer crown rot once planted.
- Pests and disease, acceptable: a few aphids can be washed off. Reject heavy infestations, sticky leaves, white cottony masses, or fine webbing from spider mites.
How to check quickly: gently squeeze the root ball from the top. It should be firm and springy, not mushy. Pull the plant out by the stem only if the grower allows it. White, healthy roots and plenty of small green buds are what I look for.
Where to buy mums, comparing garden centers, local growers, big box stores, and mail order
Where you buy affects variety, quality, and hardiness information. Each source has pros and cons. I choose based on the look of the plants and the information on the tags.
- Local growers and independent garden centers, pros: better selection of hardy garden mums, knowledgeable staff, and reliable tags. Cons: might be pricier. I buy larger single crowns here for long-term beds.
- Big box stores, pros: cheap and convenient, large color selection. Cons: many florist mums and undersized pots, inconsistent quality. If you buy here, look closely at root and bud stage.
- Mail order, pros: access to named cultivars and late bloomers. Cons: shipping stress to plants in heat, possible delays. Order only from reputable nurseries and choose cold-pack shipping or delayed shipping to match your planting window.
Buy now in midsummer only if you have 6 to 10 weeks before your first frost. For central Ohio zone 6b, that means plant by late August to early September to be safe, since our average first frost is around October 15. In warmer zones plant later, 4 to 6 weeks before frost. In colder zones or higher elevation plant earlier, 8 to 10 weeks before frost.
If you plant in a raised bed use good drainage and a mix of 2 parts garden soil to 1 part compost and 1 to 2 inches of sand mixed in for quick drainage. For container mums, use a 10 to 12 inch pot with at least 2 quarts of peat based potting mix per plant and a slow release fertilizer measured as recommended on the bag.
For spacing, plant large-maturing mums 18 to 24 inches apart, medium plants 12 to 18 inches, and compact varieties 8 to 12 inches. Set the top of the root ball even with the surrounding soil. Planting too deep invites rot, I learned that the hard way when I buried crowns and lost plants to crown rot.
Water at planting exactly like this. Water each transplanted mum with 1 gallon of water to settle soil. During heat, give the plant 1/2 gallon every other day for the first two weeks, then reduce to about 1 gallon per plant per week as roots fill out. In very hot weather give 1/2 gallon daily for three to five days after planting. In shade or cooler conditions reduce frequency.
If you want a tight schedule: day 0, plant and 1 gallon per plant. Days 1 to 14, 1/2 gallon every other day in hot sun. After day 14, 1 gallon per week. Adjust by your soil type and rainfall. Use the guide on watering vegetable plants when you need a quick refresher on measuring one inch of water per week.
Fertilize lightly. At planting, mix 1 cup compost into each planting hole and sprinkle 1 tablespoon of 10-10-10 balanced granular fertilizer into the backfill. Repeat with the slow release product at the rate on the package once in six to eight weeks if foliage looks pale.
Pinching and pruning. If you buy mums early in the summer and want more branching, pinch back stems to 3 to 4 inches from the top when you first plant, but stop pinching by early July for central Ohio if you want blooms in September. If you are buying mums in midsummer already with buds, do not pinch. Pinching late will delay bloom or reduce flowers.
Common mistakes and how to avoid them:
- Buying florist mums and assuming they will overwinter. Instead buy hardy garden mums labeled Chrysanthemum x morifolium and hardy to your zone.
- Planting too deep. Set the crown level with soil surface, not below it.
- Ignoring rootbound pots. A rootbound mum may never break out. Loosen circling roots gently, or choose a different plant.
- Overwatering in poor drainage. If your bed holds water, plant on a 2 to 3 inch raised ridge or in a raised bed to avoid rot.
For companion planting, mums mix well with late-season sages, ornamental grasses, and the herbs listed in this guide to the best herbs for small backyard gardens. They also look good at the front of a vegetable bed; if you grow in close quarters, review the tips in my raised bed guide before placing them.
FAQ heading
How soon before first frost should I plant mums?
Plant mums so they have 6 to 8 weeks to set roots before your first frost, longer for late bloomers. For central Ohio zone 6b aim to plant by late August to early September for reliable fall blooms. In warmer zones you can push planting later by 1 to 2 weeks, in colder zones plant 1 to 2 weeks earlier.
Can I plant a mum with open flowers now and still get fall color?
If the plant has mostly open flowers you will still have color, but many blooms may be past their best by the garden peak. Choose plants with tight green buds or a mix of buds and a few open flowers for the longest display.
Do I need to fertilize mums after planting?
Yes, but lightly. Mix 1 cup compost into each hole at planting and add 1 tablespoon of 10-10-10 into the backfill. Apply a slow release fertilizer once according to package directions about six to eight weeks later if foliage looks pale. Too much fertilizer causes leggy growth and fewer flowers.
Will mums survive my winter?
Only if they are hardy varieties for your USDA zone and planted with good drainage. Look for hardy tags and cultivar information. In zone 6b, many garden mums survive if planted correctly and mulched after the ground freezes. Florist mums often do not overwinter.
How much water does a newly planted mum need?
Water each transplant with 1 gallon at planting. In hot midsummer give 1/2 gallon every other day for two weeks, then about 1 gallon per plant per week while roots establish. Adjust for rainfall and soil type. Sandy soils need more frequent watering, clay soils less.
