A plant that lives for two or more years.

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3answers
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Which herbs can be grown as perennials?

What are some herbs that are perennials, i.e. they return and grow the next season? I'd like to keep a garden of herbs around for cooking.
13
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4answers
26k views

Can dahlias be grown as perennials?

The wikipedia article on dahlia says that they are perennial plants. However, the dahlia section at my local garden center claims (in their little info booklets) that they are annuals. Upon further ...
12
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4answers
1k views

Hardy edible perennials that are easy to propagate?

I'm looking for hardy (USDA Z4/Z5; -15F winter lows) perennials (or low maintenance reseeding annuals) that are easy/reliable to propagate either via cuttings, division, or seed. The growing season is ...
12
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2answers
368 views

Do perennials need to be split?

This Old House recently published an article about splitting overgrown perennials. They suggest doing so every three to six years--however, I have a large bed of daylilies, and it's hard for me to ...
11
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3answers
1k views

What are some tall, narrow perennials suited for dry soils, sun & shade?

I have an herb garden that stays quite dry. Although this garden is in the notoriously wet Pacific Northwest (USDA zone 8a), it is against a two story south-facing brick wall, under a large overhang, ...
9
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2answers
193 views

Are chilis an annual plant?

Are chili plants an annual plant? I have read on the web that they are perennials. But mine have never lasted more than a year.
9
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1answer
248 views

Are goldenrod cultivars manageable or troublesome?

We have a tough dry spot in the garden (USDA zone 4) about 2' x 5' where a goldenrod cultivar would go nicely. The native species, although attractive, has a tendency to seed freely and be almost ...
7
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1answer
55 views

How to plant herbaceous perennials under an existing tree without harming it

I've seen beautiful plantations of herbaceous perennials plants under mature deciduous trees and I would like to plant something similar. My concern is for the tree itself (an Autumn Blaze maple in ...
7
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1answer
490 views

What is this plant, which has a spreading root system and purple, crinkled petunia-like flowers?

Click to enlarge This is a hardy perennial that grows up to 5' tall. It has a spreading root system and purple, crinkled petunia-like flowers. What is it?
6
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2answers
39 views

Caring for & maintaining thyme

We have some thyme in our perennial bed and after seeing that it is quite frost hardy I'm realizing I don't know much about this plant. Specifically, I'm interested in how best to keep harvesting ...
6
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2answers
371 views

Coleus - annual or 'tender' perennial?

So I picked up a couple of mid-sized Coleus plants (a 'Ruby Dreams' and a 'Dream Catcher') from the local nursery today. I plan to put them in a shady area which gets indirect light for a few hours a ...
6
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2answers
2k views

How can I tell what animal is eating my plants?

Many of my perennial garden plants have been getting eaten by some animal. Possible culprits include deer, rabbits, and groundhogs. I would like to control them, but I have to know what I am ...
6
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1answer
481 views

What is this low growing square-stemmed plant in my lawn?

I have a small, dense, spreading herbaceous perennial plant in my lawn. I don't have anything against it, but I would like to know what it is. It has slightly square stems and rounded leaves. It has ...
6
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2answers
813 views

How do I prepare a chili plant for a second year's growth?

I have finally managed to make one of my chili plants (variety unknown) live into its second year! I've kept it indoors so far this winter. As it will be spring in a couple of months (I'm in the UK), ...
6
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1answer
88 views

Please help me identify this bulbous plant with long, broad leaves and white flowers

I rescued this plant from a landfill in Johannesburg, South Africa. It has taken well in my garden and is blooming in just the second season that it's been here. When I rescued it, I thought it was ...
6
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1answer
43 views

What should I do with perennials in pots over the winter?

I had a small stone planter box built in to my front entrance. In this planter I had a handful of perennials. I needed to have my driveway torn up and repaved this year, and I thought it would be ...
5
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2answers
210 views

What kind of shrub with long green spiky leaves is this?

I got stuck in the forehead by one of the spines Wednesday and it is still sore. It bled a lot Wednesday. Yesterday I popped it and some pus came out. It is still red and sore. I just want to check ...
5
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2answers
831 views

Can I save the berries from a Big Blue Liriope (Liriope muscari) and plant them next spring?

I have a big blue liriope (Liriope muscari) in my yard, and the flowers have changed to berries. I imagine the normal propagation method is to split the adult plant after it grows large enough, but if ...
5
votes
1answer
112 views

What is the name of this low-growing plant with pink flowers?

The plant is small, just about 4 inches tall, growing in my front yard, in Sydney, Australia. The leaves are grass like and the little flower is quite fragrant. I just can't recall the name, can ...
5
votes
1answer
426 views

What is the medium-leaved, thick-stemmed plant?

This plant was at the end of driveway, getting tossed by a previous owner. I'd like to care of it but I have zero idea what it is. Does any one know a likely candidate?
5
votes
3answers
129 views

What is this tall perennial with fragrant white flowers?

My grandmother brought me a bunch of shade-loving plants from her garden to help me fill in a few gaps in my own. She had most of them identified but this one had her stumped. Here's what I know from ...
5
votes
1answer
503 views

Which grass is best suited as an indoor perennial?

I would like to decorate our living room with a strip of grass. Which type should I grow? The requirements are as following: should be a perennial or at least grow for a year or so slow growing, ...
5
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1answer
66 views

Why does my garden centre say these plants are annuals?

I'm in the UK (so hardiness zone 8/9), and my local garden centre is selling Chrysanthemums and Michaelmas daisies, labelled as "one season only". I'm sure as a kid my gran had (the same) ...
5
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2answers
53 views

Hearty Flowering Perennial for curbside appeal

I'm lost in a sea of articles with none of them actually answering my question so I turn here. Currently I plant mums every year in my front yard (Midwest region: Kansas, Lots of sunlight on the ...
5
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1answer
722 views

What is this 2' high plant with curved spikes of white flowers, growing in eastern Massachusetts?

Please identify this plant. It is about two feet tall and thriving in the shade of large trees near the edge of a small street.
5
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1answer
269 views

What would be a good “cat grass” for the central Texas heat?

So I can buy the little pots of "cat grass" or even the grow kits at my local pet store, but I thought it would be more fun to have a little patch of it growing in the yard that (hypothetically) would ...
5
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1answer
163 views

Is Poke Milkweed nice or nasty?

I am growing this from seed: Asclepias exaltata which is not the poisonous pokeweed Poke Milkweed Height .5-1.5m Zone: 4 The grower, Gardens North, claims it is: Found in the wild in rich ...
4
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2answers
3k views

What's the difference between annual, biennial, and perennial plants?

Before deciding whether to purchase a plant, and how best to plan where to place it, the basic knowledge of how long it lives and how often it blooms is a necessity. What's the difference between ...
4
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3answers
38 views

How can I ensure my perennial herbs survive in an above ground planter (1.5' x 5') year round?

Never been much of a gardener, so 10 years ago I bought a house with a mostly asphalt backyard. So, different season of life now, my wife and I are starting a small garden of mostly food bearing ...
4
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1answer
225 views

What flowers and shrubs will grow without outside help?

I would like to plant some shrubs and/or flowers in a mostly wooded area behind my house (in NE Oklahoma). What are some good candidates that are (1) cheap, (2) perennial, and (3) hardy enough to ...
4
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1answer
41 views

How do I subdivide mature chrysanthemums?

This spring, I bought little chrysanthemums (mums) of different shapes and colors at a neighborhood market. They have developed very well and now (in autumn) blossom in beautiful colors, e.g. ...
4
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1answer
33 views

Dividing Montauk Daisies

Also known more properly as Nippon Daisies, I have a planting of this stuff. I hadn't noticed it flowering last year and had planned on ripping it out this fall not knowing what it was other than ...
4
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1answer
210 views

When should Bee Balm bloom in Zone 6 (it did not bloom last year)?

Two years ago we planted some bee balm. We trimmed it back in early March last year and it never bloomed, though the plant was otherwise healthy and bushy. We trimmed it back again this year. Is ...
4
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1answer
105 views

Should I prune lavender on a cold/wet day in Spring?

I'd like to prune lavender for the spring season. Today it's a cold and wet day (2 to 7 degrees Celsius and some rainfall, in Europe), the weather forecast says next week will be sunny, but I'll ...
4
votes
1answer
498 views

What is this carefree succulent flowering potted plant?

Anyone know what plant this is? It was planted in a large pot a long time ago by a friend. The dirt in the pot has not been changed for years! It blooms around the summer time and stays till mid ...
4
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1answer
117 views

Should perennials purchased at a greenhouse nursery be acclimatized before planting outside?

Most local nurseries in my area keep perennial plants outside during the summer months. There is one nursery which grows and keeps everything inside a greenhouse all the time. In zone 4 or 5, does ...
4
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1answer
95 views

Ferns have not survived winter, what might be the case?

We are renting a flat with a nice garden in Leeds UK. It has a nice garden in the back yard and when we moved in in July 2014 there were 4 healthy ferns pleasing my eye. Now, with winter having ...
4
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1answer
107 views

How do I breed Black eyed Susans?

I've recently acquired a nice-sized Black eyed Susan (Rudbeckia hirta) plant. But unfortunately I've only got one, when I would like to have several. How would I go about multiplying this plant?
4
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2answers
4k views

What's the best way to grow Crocosmia from seed?

I collected seed from my Crocosmia (I believe "Honey Angels") and I'd like to see whether I can get healthy plants from them or not. What are the right conditions to make them germinate? When do I ...
4
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1answer
435 views

What should I do to make my strawberry a perennial?

http://homeguides.sfgate.com/care-tristar-strawberries-45860.html says that Strawberries grow as perennials in U.S. Department of Agriculture plant hardiness zones 3 through 9, depending on the ...
4
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1answer
704 views

What's eating this Weigela Shrub?

I planted some Fine Wine Weigela shrubs last fall. They seemed to be doing OK over spring then in the summer they took a turn in the wrong direction. They lost their color and are a light green. ...
4
votes
1answer
341 views

What is this plant with spiky leaves found on a beach in Indonesia?

Some time ago I found a plant on Depok Beach (Yogyakarta, Indonesia). This is what it looks like: It looks like spiky leaves that grow from its branches. The leaves are actually quite hard: you ...
3
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2answers
1k views

Why are my hibiscus buds & leaves randomly turning yellow and dropping off?

Besides the random yellowing and dropping off of leaves and buds, the plant is otherwise putting out new buds and flowers pretty well. What might be causing this? The plant is in partial shade ...
3
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4answers
870 views

What are some recommended perennials to grow under large spruce trees in an area of about 350 sq. feet?

I have a small area which I would like to fill with (hopefully perennial) foliage plants, to green it up. I was thinking a variety of different hostas would fit the bill. If this was your bed, what ...
3
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1answer
124 views

What are these flowering perennials with white flowers?

What are these flowering perennials with white flowers (growing in a yard in Northeast Ohio)?
3
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1answer
113 views

Can somebody try to identify this potential perennial?

I was cleaning out some gardens and am not sure what this is. Is it a weed or not?
3
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1answer
20 views

How to prepare herbs for winter?

I've got tomato, basil, rosemary, thyme and peppermint plants. I've read that the rosemary and peppermint are perennials. How do I prepare my [plants that should live until next year]? We had our ...
3
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1answer
65 views

What has caused my Bleeding Hearts to multiply and spread?

I planted three Bleeding Hearts last year. They were healthy and very pretty. This year there are seven or eight others all around the yard, as far away as fifty feet! They're even popping up under ...
3
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1answer
105 views

Help on identifying a sharp leaved white-(another variety of it is red-)flowered perennial

In my garden I have a perennial (at least in a second year) in two varieties (one white-flowered, one red) of the scrub pictured below. I collected seed from it last year and I got seedlings from it ...
3
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1answer
34 views

How late into fall is perennial transplanting viable?

What is the generally rule of thumb (if there is one) for transplanting perennials? I have a bunch of hostas to divide and transplant. I could wait until spring, but wondering how late into fall I ...